Orangutan: Difference between revisions

Orangutans
	Bornean orangutan (Pongo pygmaeus)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Primates
Family:	Hominidae
Subfamily:	Ponginae
Genus:	Pongo; Lacépède, 1799
Type species
	Pongo borneo; Lacépède, 1799 (= Simia pygmaeus Linnaeus, 1760)
Species
	Pongo pygmaeus; Pongo abelii
	Range of the two orangutan species
Synonyms
	Faunus Oken, 1816 ; Lophotus Fischer, 1813 ; Macrobates Bilberg, 1828 ; Satyrus Lesson, 1840

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The orangutans are the two exclusively Asian species of extant great apes. Native to Indonesia and Malaysia, orangutans are currently found only in the rainforests of Borneo and Sumatra. Classified in the genus Pongo, orangutans were considered to be one species. However, since 1996, they were divided into two species: the Bornean orangutan (P. pygmaeus) and the Sumatran orangutan (P. abelii). In addition, the Bornean species is divided into three subspecies. The orangutans are also the only surviving species of the subfamily Ponginae, which also included several other species like Gigantopithecus, the largest known primate. Both species had their genomes sequenced and they appear to have diverged around 400,000 years ago. Orangutans diverged from the rest of the great apes approximately 15.7 to 19.3 mya (million years ago).

Orangutans are the most arboreal great apes and spend most of their time in trees. Their hair is typically reddish-brown, instead of the brown or black hair typical of chimpanzees and gorillas. Males and females differ in size and appearance. Dominant adult males have distinctive cheek pads and produce long calls that attract females and intimidate rivals. Younger males do not have these characteristics and resemble adult females. Orangutans are the most solitary of the great apes, with social bonds occurring primarily between mothers and their dependent offspring, who stay together for the first two years. Fruit is the most important component of an orangutan's diet, however, the apes will also eat vegetation, bark, honey, insects and even bird eggs. They can live over 30 years in both the wild and captivity.

Orangutans are among the most intelligent primates and use a variety of sophisticated tools, also constructing elaborate sleeping nests each night from branches and foliage. The apes have been extensively studied for their learning abilities. There may even be distinctive cultures within populations. Field studies of the apes were pioneered by primatologist Birutė Galdikas. Both orangutan species are considered to be Endangered with the Sumatran orangutan being Critically Endangered. Human activities have decimated the populations and ranges of both species. Threats to wild orangutan populations include poaching, habitat destruction and the illegal pet trade. There are several conservation and rehabilitation organisations dedicated to the survival of orangutans in the wild.

Etymology

The name orangutan (also written orang-utan, orang utan, orangutang, and ourang-outang) is derived from the Malay and Indonesian words orang meaning "person" and hutan meaning "forest",^[1] thus "person of the forest".^[2] Orang Hutan was originally not used to refer to apes, but to forest dwelling humans. The Malay words used to refer specifically to the ape is maias and mawas, but it is unclear if those words refer only to orangutans, or to all apes in general. The first attestation of the word to name the Asian ape is in Jacobus Bontius' 1631 " Historiae naturalis et medicae Indiae orientalis" - he described that Malaysians had informed him that the ape was able to talk, but preferred not to "lest he be compelled to labour"^[3] The word appeared in several German language descriptions of Indonesian zoology in the 17th century. It has been noted that the likely origin of the word comes specifically from the Banjarese variety of Malay.^[4]

The word was first attested in English in 1691 in the form orang-outang, and variants with -ng instead of -n as in the Malay original are found in many languages. This spelling (and pronunciation) has remained in use in English up to the present, but has come to be regarded as incorrect.^[5]^[6]^[7] The loss of "h" in Utan and the shift fron n to -ng has been taken to suggest that the language entered English through Portuguese.^[4] In 1869 British naturalist Alfred Russel Wallace, co-creator of modern Evolutionary theory published his account of Malaysia's wildlife: "The Malay Archipelago: The Land of the Orang-Utan and the Bird of Paradise".^[3]

The name of the genus, Pongo, comes from a 16th century account by Andrew Battell, an English sailor held prisoner by the Portuguese in Angola, which describes two anthropoid "monsters" named Pongo and Engeco. It is now believed that he was describing gorillas, but in the late 18th century it was believed that all great apes were orangutans; hence Lacépède's use of Pongo for the genus.^[8]

Taxonomy, phylogeny and genetics

The two orangutan species are the only extant members of the subfamily Ponginae. This subfamily also included the extinct genera Lufengpithecus, which lived in southern China and Thailand 2–8 mya, and Sivapithecus, which lived India and Pakistan from 12.5 mya until 8.5 mya. These apes likely lived in drier and cooler environments then orangutans do today. Khoratpithecus piriyai, which lived in Thailand 5–7 mya, is believed to have been the closest known relative of the orangutans. The largest known primate, Gigantopithecus, was also a member of Ponginae and lived in China, India and Vietnam from 5 mya to 100,000 years ago.^[9]^: 50 Within apes (superfamily Hominoidea), the gibbons diverged during the early Miocene (between 19.7 and 24.1 mya, according to molecular evidence) and the orangutans split from the African great ape lineage between 15.7 and 19.3 mya.^[10]^{: Fig. 4}

Taxonomy of genus Pongo^[11]

Phylogeny of superfamily Hominoidea^[10]^{: Fig. 4}

Genus Pongo
- Bornean orangutan (Pongo pygmaeus)
  - Pongo pygmaeus pygmaeus - northwest populations
  - Pongo pygmaeus morio - east populations
  - Pongo pygmaeus wurmbii - southwest populations
- Sumatran orangutan (Pongo abelii)

Hominoidea

	humans (genus Homo)

	chimpanzees (genus Pan)

gorillas (genus Gorilla)

orangutans (genus Pongo)

gibbons (family Hylobatidae)

The populations on the two islands were classified as subspecies until 1996^[9]^: 53, when they were elevated to full species status, and the three distinct populations on Borneo were elevated to subspecies. The population currently listed as P. p. wurmbii may be closer to the Sumatran orangutan than the other Bornean orangutan subspecies. If confirmed, abelii would be a subspecies of P. wurmbii (Tiedeman, 1808).^[12] Regardless, the type locality of pygmaeus has not been established beyond doubts, and may be from the population currently listed as wurmbii (in which case wurmbii would be a junior synonym of pygmaeus, while one of the names currently considered a junior synonym of pygmaeus would take precedence for the northwest Bornean taxon).^[12] To further confuse, the name morio, as well as some suggested junior synonyms,^[11] may be junior synonyms of the pygmaeus subspecies, thus leaving the east Bornean populations unnamed.^[12]

In addition, some fossils described under the name P. hooijeri have been found in Vietnam, and multiple fossil subspecies have been described from several parts of southeastern Asia. It is unclear if these belong to P. pygmaeus or P. abelii or, in fact, represent distinct species.^[13]

Genomics

The Sumatran orangutan genome was sequenced in January 2011.^[14]^[15] Following humans and chimpanzees, the Sumatran orangutan has become the third species of hominid to have its genome sequenced. Subquently, the Bornean species would have its genome sequenced. It was found that genetic diversity was lower in Bornean orangutans (P. pygmaeus) than in Sumatran ones (P. abelii), despite the fact that Borneo is home to six or seven times as many orangutans as Sumatra.^[15] The comparison has shown that these two species diverged around 400,000 years ago, more recently than was previously thought. It was also found that the orangutan genome has evolved much more slowly than chimpanzee and human DNA.^[15] Previously it was estimated that the species diverged 2.9 to 4.9 mya.^[10]^{: Fig. 4} The researchers hope that these data may help conservationists save the endangered ape, and also prove useful in further understanding of human genetic diseases.^[15]

Bornean orangutans have 48 diploid chromosomes.^[16]

Anatomy and physiology

An orangutan has a large, bulky body, a thick neck, very long, strong arms, short, bowed legs, and no tail. It is mostly covered with long reddish-brown hair and grey-black skin. Sumatran orangutans have the more sparse and lighter coloured coat.^[17] The orangutan has a large head with a prominent mouth area. Though largely hairless, the face of orangutan can develop some hair in males, giving them a moustache.^[18] Adult males have large cheek flaps^[9]^: 14 that show their dominance to other males. The cheek flaps are made mostly of fatty tissue and are supported by the musculature of the face.^[19] Mature males also have throat pouches that allows them to make loud calls.^[9]^: 14 There is significant sexual dimorphism: females can grow to around 127 cm (4 ft 2 in) and weigh around 45.4 kg (100 lb) while flanged adult males can reach 175 cm (5 ft 9 in) in height and weigh over 118 kg (260 lb).^[20] A male orangutans has an arm span of about 2 m (6.6 ft).^[9]^: 14

Orangutan hands are similar to humans' hands; they have four long fingers and an opposable thumb. However, the joint and tendon arrangement in the orangutans' hands produces two adaptations that are significant for arboreal locomotion. The resting configuration of the fingers is curved, creating a suspensory hook grip.^[21]^: 301 Additionally, without the use of the thumb, the fingers and hands can grip tightly around objects with a small diameter by resting the tops of the fingers against the inside of the palm, which creates a double-locked grip.^[21]^: 301

Their feet have four long toes and an opposable big toe.^[9]^: 15 Orangutans can grasp things with both their hands and their feet.^[9]^: 14 Their fingers and toes are curved, allowing them to better grip onto branches. Orangutans have less restriction in the movements of their legs than humans since their hips joint have the same flexibility as their shoulder and arm joints.^[9]^: 15 Unlike gorillas and chimpanzees, orangutans are not true knuckle-walkers, and are instead fist-walkers.^[22]

Ecology and behaviour

Orangutans live in primary and old secondary forests, particularly dipterocarp forests and peat swamp forests. Both species can be found in mountainous and lowland swampy areas. Sumatran orangutans live in elevations as high as 1500 m (4921 ft), while Bornean orangutans live no higher than 1000 m (3281 ft).^[18] Other habitats used by orangutans include grasslands, cultivated fields, gardens, young secondary forest, and shallow lakes.^[23] Orangutans are the most arboreal of the great apes, spending nearly all of their time in the trees. Most of the day is spent feeding, resting, and travelling. They start the day feeding for 2–3 hours in the morning. They rest during midday then travel in the late afternoon. When evening arrives, they begin to prepare their nests for the night.^[18] Orangutans do not swim, although they have been recorded wading in water.^[24]

The main predators of orangutans are tigers. Other predators include clouded leopards, wild dogs and crocodiles.^[18] The absence of tigers on Borneo may explain why Bornean orangutans can be found on the ground more often than their Sumatran relatives.^[25] Orangutans communicate with various sounds. Male will make long calls, both to attract females and advertise themselves to other males.^[26] Both sexes will try to intimidate conspecifics with a series of low guttural noises known collectively as the "rolling call".^[27] When annoyed, an orangutan will suck in air through pursed lips, which makes a kissing sound and is hence known as the "kiss squeak". Infants make soft hoots when distressed. Orangutans are also known to blow a raspberry.^[27]

Diet

Orangutans are opportunistic foragers, and their diets vary markedly from month to month.^[28] Fruit makes up 65–90% of the orangutan diet, and those with sugary or fatty pulp are favoured. Ficus fruits are commonly eaten and are easy to harvest and digest. Lowland dipterocarp forests are preferred by orangutans because of their plentiful fruit. Bornean orangutans consume at least 317 different food items that include young leaves, shoots, bark, insects, honey and bird eggs.^[18]^[28]

A decade-long study of urine and faecal samples at the Gunung Palung Orangutan Conservation Project in West Kalimantan has shown that orangutans give birth during and after the high fruit season (though not every year), during which they consume various abundant fruits, totaling up to 11,000 calories per day. In the low fruit season they eat whatever fruit is available in addition to tree bark and leaves, with daily intake at only 2,000 calories. Together with a long lactation period, orangutans also have a long birth interval.^[29]

Orangutans are thought to be the sole fruit disperser for some plant species including the climber species Strychnos ignatii which contains the toxic alkaloid strychnine.^[30] It does not appear to have any effect on orangutans except for excessive saliva production.^[31]

Geophagy, the practice of eating soil or rock, has been observed in orangutans. There are three main reasons for this dietary behaviour; for the addition of mineral nutrients to their diet; for the ingestion of clay minerals that can absorb toxic substances; or to treat a disorder such as diarrhoea.^[32] Orangutans also use plants of the genus Commelina as an anti-inflammatory balm.^[33]

Social life

Orangutans live a more solitary lifestyle than the other great apes. Most social bonds occur between adult females and their dependent and weaned offspring. Adult males and independent adolescents of both sexes tend to live alone.^[34] Orangutan societies are made up of resident and transient individuals of both sexes. Resident females live with their offspring in defined home ranges that overlap with those of other adult females, who may be their immediate relatives. One to several resident female home ranges are encompassed within the home range of a resident male, who is their main mating partner.^[35] Transient males and females move widely.^[34] Orangutans usually travel alone, but they may travel in small groups in their sub-adult years. However this behaviour ends at adulthood. The social structure of the orangutan can be best described as solitary but social. Interactions between adult females range from friendly, to avoidance to antagonistic. Resident males may have overlapping ranges and interactions between them tend to be hostile.^[35]

During dispersal, females tend to settle in home ranges that overlap with their mothers. However, they do not seem to have any special social bonds with them.^[36] Males disperse much farther from their mothers and enter into a transient phase. This phase lasts until a male can challenge and displace a dominant, resident male from his home range.^[37] Adult males dominate sub-adult males.^[38] Both resident and transient orangutans aggregate on large fruiting trees to feed. The fruits tend to be abundant, so competition is low and individuals may engage in social interactions.^[35] Orangutans will also form traveling groups with members moving between different food sources.^[37] These groups tend to be made of only a few individuals. They also tend to be consortships between an adult male and female.^[35]

Nesting

Orangutans build nests specialized for both day or night use. These are carefully constructed; young orangutans learn from observing their mother's nest-building behaviour. In fact, nest-building is a leading cause in young orangutans leaving their mother for the first time. From six months of age onwards, orangutans practice nest building and gain proficiency by the time they are three years old.^[39]

Construction of a night nest is done by following a sequence of steps. Initially a suitable tree is located, orangutans being selective about sites even though many tree species are utilised. The foundation is then built by pulling together branches under them and joining them at a point. After the foundation has been built, the orangutan bends smaller, leafy branches onto the foundation; this serves the purpose of and is termed as the "mattress". After this orangutans stand and braid the tips of branches into the mattress. This increases the stability of the nest and forms the final act of nest building. In addition, orangutans may add additional features such as "pillows", "blankets", "roofs" and "bunk-beds" to their nest.^[39]

Reproduction and parenting

Males mature at around 15 years of age, by which time they have fully descended testicles and can reproduce. However they exhibit arrested development by not developing the distinctive cheek pads, pronounced throat pouches, long fur or long-calls until they are between 15 and 20 years old.^[35] The development of these characteristics depends largely on the absence of a resident male.^[40] Males without them are known as unflanged males in contrast to the more developed flanged males. The transformation from unflanged to flanged can occur very quickly. Unflanged and flanged males have two different mating strategies. Flanged males attract oestrous females with their characteristic long calls.^[26] Those calls may also suppress development in younger males.^[37] Unflanged males wander widely in search of oestrous females and upon finding one, will force copulation on her. Both strategies are successful,^[26] however females prefer to mate with flanged males and seek their company for protection against unflanged males.^[38] Resident males may form consortships with females that can last days, weeks or months after copulation.^[26]

Infants cling to their mothers for the first four months.

Female orangutans experience their first ovulatory cycle around 5.8–11.1 years. These occur earlier in females with more body fat.^[35] Like other great apes, female orangutans enter a period of infertility during adolescence which may last for 1–4 years.^[35] Female orangutans also have a 22–30 day menstrual cycle. Gestation lasts for nine months with females giving birth to their first offspring between the ages of 14 and 15 years. Female orangutans have eight year intervals between births; the longest interbirth intervals among the great apes.^[35] Unlike many other primates, male orangutans do not seem to practice infanticide. This may be because they cannot ensure that they will sire a female's next offspring because she does not immediately begin ovulating again after her infant dies.^[41]

Male orangutans play almost no role in raising the young. Females do most of the caring and socializing of the young. A female often has an older offspring with her to help in socializing the infant.^[42] Infant orangutans are completely dependent on their mothers for the first two years of their lives. The mother will carry the infant during traveling, as well as feed it and sleep with it in the same night nest.^[35] For the first four months, the infant is carried on its belly and never relieves physical contact. In the following months, the time a infant spends with its mother decreases.^[42] When an orangutan reaches the age of two, its climbing skills improve and will travel through the canopy holding hands with other orangutans, a behaviour known as "buddy travel".^[42] Orangutans are juveniles for about two to five years of age and will start to temporarily move away from their mothers.^[35] Juveniles are usually weaned at about four years of age. Adolescent orangutans will socialize with their peers while still having contact with their mothers.^[35]

Typically, orangutans live over 30 years in both the wild and captivity.^[9]^: 14

Intelligence

Orangutans are among the most intelligent primates. Experiments suggest that they can figure out some invisible displacement problems with a representational strategy.^[43] In addition, Zoo Atlanta has a touch screen computer where their two Sumatran orangutans play games. Scientists hope that the data they collect from this will help researchers learn about socializing patterns, such as whether they mimic others or learn behaviour from trial and error, and hope the data can point to new conservation strategies.^[44] A 2008 study of two orangutans at the Leipzig Zoo showed that orangutans are the first non-human species documented to use 'calculated reciprocity' which involves weighing the costs and benefits of gift exchanges and keeping track of these over time.^[45] Orangutans are very technically adept nest builders, making a new nest each evening in only in 5 to 6 minutes and choosing branches which the orangutan knows can support its body weight.^[46]

Tool use and culture

Tool use in orangutans was observed by primatologist Birutė Galdikas in ex-captive populations.^[47] In addition, evidence of sophisticated tool manufacture and use in the wild was reported from a population of orangutans in Suaq Balimbing (Pongo abelii) in 1996.^[48] These orangutans developed a tool kit for use in foraging that consisted of both insect-extraction tools for use in the hollows of trees and seed-extraction tools for harvesting seeds from hard-husked fruit. The orangutans adjusted their tools according to the nature of the task at hand and preference was given to oral tool use.^[49] This preference was also found in an experimental study of captive orangutans (P. pygmaeus).^[50]

Primatologist Carel P. van Schaik and biological anthropologist Cheryl D. Knott further investigated tool use in different wild orangutan populations. They compared geographic variations in tool use related to the processing of Neesia fruit. The orangutans of Suaq Balimbing (P. abelii) were found to be avid users of insect and seed-extraction tools when compared to other wild orangutans.^[51]^[52] The scientists suggested that these differences are cultural. The orangutans at Suaq Balimbing live in dense groups and are socially tolerant; this creates good conditions for social transmission.^[51] Further evidence that highly social orangutans are more likely to exhibit cultural behaviours came from a study of leaf-carrying behaviours of ex-captive orangutans that were being rehabilitated on the island of Kaja in Borneo.^[53]

Wild orangutans (P. pygmaeus wurmbii) in Tuanan, Borneo, were reported to use tools in acoustic communication.^[54] They use leaves to amplify the kiss squeak sounds that they produce. Some have suggested that the apes employ this method of amplification in order to deceive the listener into believing that they are larger animals.^[54]

In 2003, researchers from six different orangutan field sites who used the same behavioural coding scheme compared the behaviours of the animals from the different sites.^[55] They found that the different orangutan populations behaved differently. The evidence suggested that the differences in behaviour were cultural: first, because the extent of the differences increased with distance, suggesting that cultural diffusion was occurring, and second, because the size of the orangutans' cultural repertoire increased according to the amount of social contact present within the group. Social contact facilitates cultural transmission.^[55]

Possible lingustic capabilities

A two year study of orangutan symbolic capability was conducted from 1973 to 1975 by zoologist Gary L. Shapiro with Aazk, a juvenile female orangutan at the Fresno City Zoo (now Chaffee Zoo) in Fresno, California. The study employed the techniques of psychologist David Premack who used plastic tokens to teach linguistic skills to the chimpanzee, Sarah.^[56] Shapiro continued to examine the linguistic and learning abilities of ex-captive orangutans in Tanjung Puting National Park, in Indonesian Borneo, between 1978 and 1980. During that time, Shapiro instructed ex-captive orangutans in the acquisition and use of signs following the techniques of psychologists R. Allen Gardner and Beatrix Gardner who taught the chimpanzee, Washoe, in the late-1960s. In the only signing study ever conducted in a great ape's natural environment, Shapiro home-reared Princess, a juvenile female who learned nearly 40 signs (according to the criteria of sign acquisition used by psychologist Francine Patterson with Koko, the gorilla) and trained Rinnie, a free-ranging adult female orangutan who learned nearly 30 signs over a two year period.^[57] For his dissertation study, Shapiro examined the factors influencing sign learning by four juvenile orangutans over a 15-month period.^[58]

Orangutans and humans

Orangutans were known to the native people of Sumatra and Borneo for millennia. While some communities hunted them for food and decoration, others placed taboos on such practices.^[9]^: 66 In central Borneo, some traditional folk beliefs consider it bad luck to look in the face of an orangutan. Some folk tales involve orangutans mating with and kidnapping humans.^[9]^: 68 There are even stories of hunters being seduced by female orangutans.^[9]^: 71 Europeans became aware of the existence of the orangutan possibly as early as the 17th century.^[9]^: 68 European explorers in Borneo hunted orangutans extensively during the 19th century.^[9]^: 65 The first accurate description of orangutans was given by Dutch anatomist Petrus Camper, who observed the animals and dissected some specimens.^[9]^: 64 However, little was known about orangutans until the field studies of Birutė Galdikas,^[59] who became a leading authority on the apes.^[60]

When she arrived in Borneo, Galdikas settled into a primitive bark and thatch hut, at a site she dubbed Camp Leakey, near the edge of the Java Sea.^[60] Despite numerous hardships, she remained there for over 30 years and became an outspoken advocate for orangutans and the preservation of their rainforest habitat, which is rapidly being devastated by loggers, palm oil plantations, gold miners, and unnatural forest fires. Galdikas's conservation efforts have extended well beyond advocacy, largely focusing on rehabilitation of the many orphaned orangutans turned over to her for care.^[60] Galdikas is considered to be one of Leakey's Angels, along with Jane Goodall and Dian Fossey.^[61]

Male orangutans have been reported to display sexual attraction to human women to the point of rape. The cook of noted primatologist Birutė Galdikas was raped by an orangutan.^[62] According to reporter Carole Jahme, rape "was almost the fate of Julia Roberts" when she was seized by a male orangutan before being freed by the film crew.^[63]

Conservation

Conservation status

The Sumatran species is critically endangered^[64] and the Bornean species of orangutan is endangered^[65] according to the IUCN Red List of mammals, and both are listed on Appendix I of CITES.^[64]^[65] The Bornean orangutan population declined by 50% in the past 60 years. Its range has become patchy throughout Borneo: being largely extirpated form various parts of the island, including the south-east.^[65] The largest remaining population is found in the forest around the Sabangau River, but this environment is at risk.^[66] Sumatran orangutan populations declined by 80% in 75 years.^[64] This species is now found only in the northern part of Sumatra, with most of the population inhabiting the Leuser Ecosystem.^[64] In late March 2012 it was reported that some of the last Sumatran orangutans in northern Sumatra were threatened with approaching forest fires and might be wiped out entirely within a matter of weeks.^[67]

Estimates between 2000 and 2003 found that 7,300 Sumatran orangutans^[64] and between 45,000 and 69,000 Bornean orangutans^[65] remain in the wild. A 2007 study by the Government of Indonesia noted in 2004 it was estimated that there was a total wild population of 61,234 orangutans, 54,567 of which were found on the island of Borneo. The table below shows a breakdown of the species and subspecies and their estimated populations from the report:^[68]

Scientific name	Common name	Region	Estimated number
Pongo abelii	Sumatran orangutan	Sumatra	6,667
Pongo pygmaeus	Bornean orangutan	Borneo
P. p. morio	Northeast Bornean orangutan	Sabah	11,017
P. p. morio	Northeast Bornean orangutan	East Kalimantan	4,825
P. p. wurmbii	Central Bornean orangutan	Central Kalimantan	>31,300
P. p. pygmaeus	Northwest Bornean orangutan	West Kalimantan and Sarawak	7,425

Video of Orangutans at a rehabilitation centre in Borneo

During the early 2000s, orangutan habitat has decreased rapidly due to logging and forest fires, as well as fragmentation by roads.^[64]^[65] A major factor in that period of time has been the conversion of vast areas of tropical forest to oil palm plantations in response to international demand. Palm oil is used for cooking, cosmetics, mechanics, and biodiesel.^[65] There is also a major problem with hunting^[64]^[65] and the illegal pet trade.^[64]^[65] Orangutans may be killed for the bushmeat trade, crop protection or for use for traditional medicine. Orangutan bones are secretly traded in souvenir shops in several cities in Kalimantan, Indonesia.^[69] Mother orangutans are killed so their infants can be sold as pets, and many of these infants die without the help of their mother.^[70] Since 2004, several pet orangutans were confiscated by local authorities and sent to rehabilitation centres.^[65]

Conservation centres and organisations

A number of organisations are working for the rescue, rehabilitation and reintroduction of orangutans. The largest of these is the Borneo Orangutan Survival Foundation, founded by conservationist Willie Smits. It is audited by a multinational auditor company^[71] and operates a number of large projects, such as the Nyaru Menteng Rehabilitation Program founded by conservationist Lone Drøscher Nielsen.^[72]^[73]

Other major conservation centres in Indonesia include those at Tanjung Puting National Park and Sebangau National Park in Central Kalimantan, Kutai in East Kalimantan, Gunung Palung National Park in West Kalimantan, and Bukit Lawang in the Gunung Leuser National Park on the border of Aceh and North Sumatra. In Malaysia, conservation areas include Semenggoh Wildlife Centre in Sarawak and Matang Wildlife Centre also in Sarawak, and the Sepilok Orang Utan Sanctuary near Sandakan in Sabah.^[74] Major conservation centres that are headquartered outside of the orangutan's home countries; include Orangutan Foundation International, which was founded by Birutė Galdikas,^[75] and the Australian Orangutan Project.^[76]

Conservation organisations such as Orangutan Land Trust work with the palm oil industry to improve sustainability and encourages the industry to establish conservation areas for orangutans.^[77] It works to bring different stakeholders together to achieve conservation of the species and its habitat.^[78]

References

^ Douglas Harper. ""Orangutan" entry in Etymology Online". Retrieved 4 May 2012.
^ "National Geographic". National Geographic Society. Retrieved 25 July 2009.
^ ^a ^b Dellios, Paulette. 2008 A lexical odyssey from the Malay World. Journal of Pidgin and Creole Languages 23:1
^ ^a ^b Mahdi, Waruno. 2007. Malay words and Malay things: lexical souvenirs from an exotic archipelago in German publications before 1700. Otto Harrassowitz Verlag, pp 170 - 181
^ "Orangutan". alphadictionary.com. Retrieved 20 December 2006.
^ Peter Tan (1998). Malay loan words across different dialects of English. English Today, 14 , pp 44-50
^ Cannon, Garland. 1992. Malay(sian) Borrowings in English, American Speech Vol. 67, No. 2, pp. 134-162
^ Groves, Colin (2002). "A history of gorilla taxonomy" (PDF). Gorilla Biology: A Multidisciplinary Perspective, Andrea B. Taylor & Michele L. Goldsmith (editors). 3. Cambridge University Press: 15–34. doi:10.2277/0521792819. {{cite journal}}: Italic or bold markup not allowed in: |journal= (help)
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Payne, J; Prundente, C (2008). Orangutans: Behavior, Ecology and Conservation. New Holland Publishers. ISBN 0-262-16253-9.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b ^c Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1016/j.ympev.2010.11.005, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1016/j.ympev.2010.11.005 instead.
^ ^a ^b Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. pp. 183–184. ISBN 0-801-88221-4. OCLC 62265494.
^ ^a ^b ^c Bradon-Jones, D.; Eudey, A. A.; Geissmann, T.; Groves, C. P.; Melnick, D. J.; Morales, J. C.; Shekelle, M.; Stewart, C. B. (2004). "Asian primate classification" (PDF). International Journal of Primatology. 25: 97–164. doi:10.1023/B:IJOP.0000014647.18720.32.
^ Schwartz, J.H.; Vu The Long; Nguyen Lan Cuong, Le Trung Kha; Tattersall, I. 1995: A review of the Pleistocene hominoid fauna of the Socialist Republic of Vietnam (excluding Hylobatidae). Anthropological papers of the American Museum of Natural History, (76): 1-24. Abstract & pdf
^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1038/nature09687, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1038/nature09687 instead.
^ ^a ^b ^c ^d Singh, Ranjeet (4 January 2011). "Orang-utans join the genome gang". Nature. doi:10.1038/news.2011.50. Retrieved 27 January 2011.
^ Sharshov, Alexander. "New Page 1". SB RAS Novobrisk. Institute of Cytology and Genetics. Retrieved 28 January 2011.
^ "Orangutan Anatomy Page". Red-ape.co.uk. Retrieved 3 July 2009.
^ ^a ^b ^c ^d ^e Cawthon Lang KA (13 June 2005). "Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology". Retrieved 12 October 2007.
^ Winkler, L. A. (1989). "Morphology and relationships of the orangutan fatty cheek pads". American Journal of Primatology. 17 (4): 305–19. doi:10.1002/ajp.1350170405.
^ "Sumatran Orangutan Society". Archived from the original on 14 November 2006. Retrieved 1 April 2007.
^ ^a ^b Schwartz, Jeffrey (1988). Orang-utan Biology. USA: Oxford University Press. ISBN 0-19-504371-5.
^ Schwartz, Jeffrey (1987). The Red Ape: Orangutans and Human Origins. Cambridge, MA: Westview Press. p. 286. ISBN 0-8133-4064-0.
^ Galdikas, BMF (1988). "Orangutan diet, range, and activity at Tanjung Puting, Central Borneo". J Mammal. 9 (1): 1–35. doi:10.1007/BF02740195.
^ Kuliukas, A. (2001). Bipedal Wading in Hominoidae past and present (PDF) (Master of Science thesis). University College London.
^ van Schaik, C.; MacKinnon, J. (2001). "Orangutans". In MacDonald, D (ed.). The Encyclopedia of Mammals (2nd ed.). Oxford University Press. pp. 420–23. ISBN 0-87196-871-1.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ ^a ^b ^c ^d Utami, SS; Goossens, B; Bruford, MW; de Ruiter, JR; van Hooff, JARAM (2002). "Male bimaturism and reproductive success in Sumatran orangutans". Behav Ecol. 13 (5): 643–52. doi:10.1093/beheco/13.5.643.
^ ^a ^b "Vocal Repertoire". Orang Utan Republik Foundation. Retrieved 17 March 2012.
^ ^a ^b Galdikas, Birute M.F. (1988). "Orangutan Diet, Range, and Activity at Tanjung Puting, Central Borneo". International Journal of Primatology. 9 (1): 1. doi:10.1007/BF02740195.
^ Asrianti, T. (2011). For orangutans, less food means lowered fertility. The Jakarta Post, 4 July 2011.
^ Rijksen, H. D. (1978). "A field study on Sumatran orang utans (Pongo pygmaeus abelii, Lesson 1827): Ecology, Behaviour and Conservation". The Quarterly Review of Biology. 53 (4): 493. doi:10.1086/410942. JSTOR 2826733. {{cite journal}}: Unknown parameter |month= ignored (help)
^ Simon, Verne A. (2010). Adaptations in the Animal Kingdom. Xlibris Corporation. p. 102. ISBN 1-4500-3364-4.
^ Highfield, Roger (1 April 2008). "Science: Monkeys were the first doctors (Telegraph.co.uk)". The Daily Telegraph. London. Retrieved 20 May 2010.
^ Matt Walker Wild orangutans treat pain with natural anti-inflammatory New Scientist 28 July 2008.
^ ^a ^b Teboekhorst, I; Schurmann, C; Sugardjito, J (1990). "Residential status and seasonal movements of wild orang-utans in the Gunung Leuser Reserve (Sumatera, Indonesia)". Animal Behaviour. 39 (6): 1098–1109. doi:10.1016/S0003-3472(05)80782-1.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Cawthon Lang KA (13 June 2005). "Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology". Retrieved 19 February 2012.
^ Singleton, I; van Schaik, CP. (2002). "The social organisation of a population of Sumatran orangutans". Folia Primatol. 73 (1): 1–20. doi:10.1159/000060415. PMID 12065937.
^ ^a ^b ^c Delgado, RA Jr.; van Schaik, CP. (2000). "The behavioral ecology and conservation of the orangutan (Pongo pygmaeus): a tale of two islands". Evol Anthro. 9 (1): 201–18. doi:10.1002/1520-6505(2000)9:5<201::AID-EVAN2>3.0.CO;2-Y.
^ ^a ^b Fox, EA. (2002). "Female tactics to reduce sexual harassment in the Sumatran orangutan (Pongo pygmaeus abelii)". Behav Ecol Sociobiol. 52 (2): 93–101. doi:10.1007/s00265-002-0495-x.
^ ^a ^b Didik, Prasetyo (2009). "Nest building in orangutans". In Wich, Serge A.; Atmoko, S. Suci Utami; Setia, Tatang Mitra (eds.). Orangutans: geographic variation in behavioral ecology and conservation. Oxford University Press. pp. 270–275. ISBN 978-0-19-921327-6. Retrieved 5 July 2011. {{cite book}}: External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ Schürmann, CL; van Hooff, JARAM (1986). "Reproductive strategies of the orangutan: new data and a reconsideration of existing sociosexual models". Int J Primatol. 7 (3): 265–87. doi:10.1007/BF02736392.
^ Beaudrot, LH; Kahlenberg, SM; Marshall, AJ (2009). "Why male orangutans do not kill infants". Behav Ecol Sociobiol. 63 (11): 1549–1562. PMC 2728907. PMID 19701484.
^ ^a ^b ^c Munn C, Fernandez M. (1997) Infant development. In: Orangutan species survival plan husbandry manual, Sodara C,( ed) Chicago (IL): Orangutan Species Survival Plan. p 59–66.
^ Deaner, RO; van Schaik, CP; Johnson, V. (2006). "Do some taxa have better domain-general cognition than others? A meta-analysis of nonhuman primate studies" (PDF). Evol Psych. 4: 149–196.
^ Turner, Dorie (12 April 2007). "Orangutans play video games (for research) at Georgia zoo". Retrieved 12 April 2007.
^ Dufour, V. Pelé, M.; Neumann, M.; Thierry, B.;Call, J. (2008). "Calculated reciprocity after all: computation behind token transfers in orang-utans". Biol. Lett. 5 (2): 172–75. doi:10.1098/rsbl.2008.0644.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ "Orangutan Sangat Cerdas Soal Konstruksi". 17 April 2012.
^ Galdikas, BMF (1982). "Orang-Utan tool use at Tanjung Putting Reserve, Central Indonesian Borneo (Kalimantan Tengah)". J Hum Evol. 10: 19–33. doi:10.1016/S0047-2484(82)80028-6.
^ Van Schaik, CP; Fox, EA; Sitompul, AF. (1996). "Manufacture and use of tools in wild Sumatran orangutans – implications or human evolution". Naturwissenschaften. 83 (4): 186–188. doi:10.1007/s001140050271. PMID 8643126.
^ Fox EA, Sitompul AF, Van Schaik CP. 1999. Intelligent tool use in wild Sumatran orangutans. In: Parker S, Mitchell RW and Miles HL, editors. The Mentality of Gorillas and Orangutans. Cambridge, UK : Cambridge University Press. p: 99-116
^ O'Malley, RC; McGrew, WC. (2000). "Oral tool use by captive orangutans (Pongo pygmaeus)". Folia Primatol. 71 (5): 334–341. doi:10.1159/000021756. PMID 11093037.
^ ^a ^b Van Schaik, Carel P.; Knott, Cheryl D. (2001). "Geographic variation in tool use onNeesia fruits in orangutans". American Journal of Physical Anthropology. 114 (4): 331–342. doi:10.1002/ajpa.1045. PMID 11275962.
^ Van Schaik, CP; van Noordwijk, MA; Wich, SA. (2006). "Innovation in wild Bornean orangutans (Pongo pygmaeus wurmbii)". Behaviour. 143 (7): 839–876. doi:10.1163/156853906778017944.
^ Russon, AE; Handayani, DP; Kuncoro, P; Ferisa, A. (2007). "Orangutan leaf-carrying for nest-building: toward unraveling cultural processes". Animal Cognition. 10 (2): 189–202. doi:10.1007/s10071-006-0058-z. PMID 17160669.
^ ^a ^b Hardus, ME; Lameira, AR; van Schaik, CP; Wich, SA. (2009). "Tool use in wild orang-utans modifies sound production: a functionally deceptive innovation?". Proceedings of the Royal Society B: Biological Sciences. 276 (1673): 3689–3694. doi:10.1098/rspb.2009.1027.
^ ^a ^b Van Schaik, CP; Ancrenaz, M; Borgen, G; Galdikas, B; Knott, CD; Singleton, I; Suzuki, A; Utami, SS; Merrill, M.; et al. (2003). "Orangutan cultures and the evolution of material culture". Science. 299 (5603): 102–105. doi:10.1126/science.1078004. PMID 12511649. {{cite journal}}: Explicit use of et al. in: |first9= (help)
^ Shapiro, G. L. (1975). Teaching linguistics concepts to a juvenile orangutan. California State University. Unpublished Masters Thesis.
^ Shapiro, G. L. (1982). "Sign acquisition in a home-reared/free-ranging orangutan: Comparisons with other signing apes". American Journal of Primatology. 3 (1–4): 121–29. doi:10.1002/ajp.1350030111.
^ Shapiro, G. L. (1985). Factors influencing the variance in sign learning performance by four juvenile orangutans (PDF) (Thesis). University of Oklahoma.
^ de Waal, Frans (1995). "The Loneliest of Apes". The New York Times. Retrieved 26 February 2012. {{cite news}}: Unknown parameter |month= ignored (help)
^ ^a ^b ^c Galdikas-Brindamour, Birutė (1975). "Orangutans, Indonesia's "People of the Forest"". National Geographic Magazine. Vol. 148, no. 4. pp. 444–473. {{cite news}}: Unknown parameter |month= ignored (help)
^ MacClancy, J.; Fuentes, A. (2010). Centralizing Fieldwork: Critical Perspectives from Primatology, Biological, and Social Anthropology. Berghahn Books. pp. 6–7. ISBN 978-1-84545-690-0.
^ Wrangham, Richard W; Peterson, Dale (1996). Demonic males : apes and the origins of human violence. Boston: Houghton Mifflin. p. 137. ISBN 978-0-395-69001-7.
^ ""Beauty and the Beasts" by Carole Jahme". Salon.com. 23 August 2001. Retrieved 27 January 2011.
^ ^a ^b ^c ^d ^e ^f ^g ^h Template:IUCN2010.4
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Template:IUCN2010.4
^ Cheyne, S. M.; Thompson, C. J.; Phillips, A. C.; Hill, R. M.; Limin, S. H. (2007). "Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia". Primates. 49 (1): 50–56. doi:10.1007/s10329-007-0063-0. PMID 17899314.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ "Fires threaten Sumatran orangutans". Al Jazeera. Retrieved 30 March 2012.
^ "Orangutan Action Plan 2007–2017" (PDF) (in Indonesian). Government of Indonesia. 2007. p. 5. Retrieved 1 May 2010. {{cite web}}: Cite has empty unknown parameter: |trans_title= (help)
^ "Stop orangutan skull trade". antaranews.com. 7 September 2011. Retrieved 16 January 2012.
^ Patricia L. Miller-Schroeder (2004). Orangutans. The Untamed World. p. 64. ISBN 1-55388-049-8. Retrieved 7 July 2009.
^ "About BOS Fundation". Samboja lodge. Retrieved 25 March 2012.
^ "10 Years: Nyaru Menteng 1999–2009" (PDF). Orangutan Protection Foundation.
^ "Ny projektledare på Nyaru Menteng". savetheorangutan.se. 26 January 2012.
^ "Sepilok Orang Utan Sanctuary". Tourism Malaysia. Retrieved 30 December 2011.
^ Martinelli, D. (2010). A Critical Companion to Zoosemiotics: People, Paths, Ideas. Springer. pp. 218–219. ISBN 978-90-481-9248-9.
^ Australian Department of the Environment and Water Resources. "Tax Deductible Organisations (Register of Environmental Organisations)". Accessed 1 August 2007.
^ Butler, R.A. (20 August 2009). "Rehabilitation not enough to solve orangutan crisis in Indonesia". mongabay.com.
^ Marusiak, J. (28 June 2011). "New deal for orangutans in Kalimantan". Eco-Business.com.

External links

Template:Link GA

[1] Douglas Harper. ""Orangutan" entry in Etymology Online". Retrieved 4 May 2012.

[NG-2] "National Geographic". National Geographic Society. Retrieved 25 July 2009.

[Dellios-3] Dellios, Paulette. 2008 A lexical odyssey from the Malay World. Journal of Pidgin and Creole Languages 23:1

[mahdi-4] Mahdi, Waruno. 2007. Malay words and Malay things: lexical souvenirs from an exotic archipelago in German publications before 1700. Otto Harrassowitz Verlag, pp 170 - 181

[5] "Orangutan". alphadictionary.com. Retrieved 20 December 2006.

[6] Peter Tan (1998). Malay loan words across different dialects of English. English Today, 14 , pp 44-50

[7] Cannon, Garland. 1992. Malay(sian) Borrowings in English, American Speech Vol. 67, No. 2, pp. 134-162

[Groves2002-8] Groves, Colin (2002). "A history of gorilla taxonomy" (PDF). Gorilla Biology: A Multidisciplinary Perspective, Andrea B. Taylor & Michele L. Goldsmith (editors). 3. Cambridge University Press: 15–34. doi:10.2277/0521792819. {{cite journal}}: Italic or bold markup not allowed in: |journal= (help)

[Payne-9] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o Payne, J; Prundente, C (2008). Orangutans: Behavior, Ecology and Conservation. New Holland Publishers. ISBN 0-262-16253-9.{{cite book}}: CS1 maint: multiple names: authors list (link)

[Israfil_et_al-10] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1016/j.ympev.2010.11.005, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi= 10.1016/j.ympev.2010.11.005 instead.

[MSW3-11] Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. pp. 183–184. ISBN 0-801-88221-4. OCLC 62265494.

[Asian-12] Bradon-Jones, D.; Eudey, A. A.; Geissmann, T.; Groves, C. P.; Melnick, D. J.; Morales, J. C.; Shekelle, M.; Stewart, C. B. (2004). "Asian primate classification" (PDF). International Journal of Primatology. 25: 97–164. doi:10.1023/B:IJOP.0000014647.18720.32.

[13] Schwartz, J.H.; Vu The Long; Nguyen Lan Cuong, Le Trung Kha; Tattersall, I. 1995: A review of the Pleistocene hominoid fauna of the Socialist Republic of Vietnam (excluding Hylobatidae). Anthropological papers of the American Museum of Natural History, (76): 1-24. Abstract & pdf

[Locke2011-14] Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1038/nature09687, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with |doi=10.1038/nature09687 instead.

[nature-15] Singh, Ranjeet (4 January 2011). "Orang-utans join the genome gang". Nature. doi:10.1038/news.2011.50. Retrieved 27 January 2011.

[16] Sharshov, Alexander. "New Page 1". SB RAS Novobrisk. Institute of Cytology and Genetics. Retrieved 28 January 2011.

[17] "Orangutan Anatomy Page". Red-ape.co.uk. Retrieved 3 July 2009.

[Cawthon-18] Cawthon Lang KA (13 June 2005). "Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology". Retrieved 12 October 2007.

[19] Winkler, L. A. (1989). "Morphology and relationships of the orangutan fatty cheek pads". American Journal of Primatology. 17 (4): 305–19. doi:10.1002/ajp.1350170405.

[20] "Sumatran Orangutan Society". Archived from the original on 14 November 2006. Retrieved 1 April 2007.

[Schwartz2-21] Schwartz, Jeffrey (1988). Orang-utan Biology. USA: Oxford University Press. ISBN 0-19-504371-5.

[Schwartz-22] Schwartz, Jeffrey (1987). The Red Ape: Orangutans and Human Origins. Cambridge, MA: Westview Press. p. 286. ISBN 0-8133-4064-0.

[Galdikas_1988-23] Galdikas, BMF (1988). "Orangutan diet, range, and activity at Tanjung Puting, Central Borneo". J Mammal. 9 (1): 1–35. doi:10.1007/BF02740195.

[24] Kuliukas, A. (2001). Bipedal Wading in Hominoidae past and present (PDF) (Master of Science thesis). University College London.

[MacDonald-25] van Schaik, C.; MacKinnon, J. (2001). "Orangutans". In MacDonald, D (ed.). The Encyclopedia of Mammals (2nd ed.). Oxford University Press. pp. 420–23. ISBN 0-87196-871-1.{{cite book}}: CS1 maint: multiple names: authors list (link)

[Utami_2002-26] Utami, SS; Goossens, B; Bruford, MW; de Ruiter, JR; van Hooff, JARAM (2002). "Male bimaturism and reproductive success in Sumatran orangutans". Behav Ecol. 13 (5): 643–52. doi:10.1093/beheco/13.5.643.

[vocal-27] "Vocal Repertoire". Orang Utan Republik Foundation. Retrieved 17 March 2012.

[international1-28] Galdikas, Birute M.F. (1988). "Orangutan Diet, Range, and Activity at Tanjung Puting, Central Borneo". International Journal of Primatology. 9 (1): 1. doi:10.1007/BF02740195.

[29] Asrianti, T. (2011). For orangutans, less food means lowered fertility. The Jakarta Post, 4 July 2011.

[30] Rijksen, H. D. (1978). "A field study on Sumatran orang utans (Pongo pygmaeus abelii, Lesson 1827): Ecology, Behaviour and Conservation". The Quarterly Review of Biology. 53 (4): 493. doi:10.1086/410942. JSTOR 2826733. {{cite journal}}: Unknown parameter |month= ignored (help)

[31] Simon, Verne A. (2010). Adaptations in the Animal Kingdom. Xlibris Corporation. p. 102. ISBN 1-4500-3364-4.

[32] Highfield, Roger (1 April 2008). "Science: Monkeys were the first doctors (Telegraph.co.uk)". The Daily Telegraph. London. Retrieved 20 May 2010.

[33] Matt Walker Wild orangutans treat pain with natural anti-inflammatory New Scientist 28 July 2008.

[Boekhorst_1990-34] Teboekhorst, I; Schurmann, C; Sugardjito, J (1990). "Residential status and seasonal movements of wild orang-utans in the Gunung Leuser Reserve (Sumatera, Indonesia)". Animal Behaviour. 39 (6): 1098–1109. doi:10.1016/S0003-3472(05)80782-1.

[Cawthon2-35] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Cawthon Lang KA (13 June 2005). "Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology". Retrieved 19 February 2012.

[Singleton_2002-36] Singleton, I; van Schaik, CP. (2002). "The social organisation of a population of Sumatran orangutans". Folia Primatol. 73 (1): 1–20. doi:10.1159/000060415. PMID 12065937.

[Delgrado_2000-37] Delgado, RA Jr.; van Schaik, CP. (2000). "The behavioral ecology and conservation of the orangutan (Pongo pygmaeus): a tale of two islands". Evol Anthro. 9 (1): 201–18. doi:10.1002/1520-6505(2000)9:5<201::AID-EVAN2>3.0.CO;2-Y.

[Fox_2002-38] Fox, EA. (2002). "Female tactics to reduce sexual harassment in the Sumatran orangutan (Pongo pygmaeus abelii)". Behav Ecol Sociobiol. 52 (2): 93–101. doi:10.1007/s00265-002-0495-x.

[WichAtmoko2009-39] Didik, Prasetyo (2009). "Nest building in orangutans". In Wich, Serge A.; Atmoko, S. Suci Utami; Setia, Tatang Mitra (eds.). Orangutans: geographic variation in behavioral ecology and conservation. Oxford University Press. pp. 270–275. ISBN 978-0-19-921327-6. Retrieved 5 July 2011. {{cite book}}: External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)

[Hooff_1986-40] Schürmann, CL; van Hooff, JARAM (1986). "Reproductive strategies of the orangutan: new data and a reconsideration of existing sociosexual models". Int J Primatol. 7 (3): 265–87. doi:10.1007/BF02736392.

[41] Beaudrot, LH; Kahlenberg, SM; Marshall, AJ (2009). "Why male orangutans do not kill infants". Behav Ecol Sociobiol. 63 (11): 1549–1562. PMC 2728907. PMID 19701484.

[Munn_1997-42] Munn C, Fernandez M. (1997) Infant development. In: Orangutan species survival plan husbandry manual, Sodara C,( ed) Chicago (IL): Orangutan Species Survival Plan. p 59–66.

[43] Deaner, RO; van Schaik, CP; Johnson, V. (2006). "Do some taxa have better domain-general cognition than others? A meta-analysis of nonhuman primate studies" (PDF). Evol Psych. 4: 149–196.

[44] Turner, Dorie (12 April 2007). "Orangutans play video games (for research) at Georgia zoo". Retrieved 12 April 2007.

[45] Dufour, V. Pelé, M.; Neumann, M.; Thierry, B.;Call, J. (2008). "Calculated reciprocity after all: computation behind token transfers in orang-utans". Biol. Lett. 5 (2): 172–75. doi:10.1098/rsbl.2008.0644.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[46] "Orangutan Sangat Cerdas Soal Konstruksi". 17 April 2012.

[47] Galdikas, BMF (1982). "Orang-Utan tool use at Tanjung Putting Reserve, Central Indonesian Borneo (Kalimantan Tengah)". J Hum Evol. 10: 19–33. doi:10.1016/S0047-2484(82)80028-6.

[48] Van Schaik, CP; Fox, EA; Sitompul, AF. (1996). "Manufacture and use of tools in wild Sumatran orangutans – implications or human evolution". Naturwissenschaften. 83 (4): 186–188. doi:10.1007/s001140050271. PMID 8643126.

[49] Fox EA, Sitompul AF, Van Schaik CP. 1999. Intelligent tool use in wild Sumatran orangutans. In: Parker S, Mitchell RW and Miles HL, editors. The Mentality of Gorillas and Orangutans. Cambridge, UK : Cambridge University Press. p: 99-116

[50] O'Malley, RC; McGrew, WC. (2000). "Oral tool use by captive orangutans (Pongo pygmaeus)". Folia Primatol. 71 (5): 334–341. doi:10.1159/000021756. PMID 11093037.

[Schaik_CP_2001-51] Van Schaik, Carel P.; Knott, Cheryl D. (2001). "Geographic variation in tool use onNeesia fruits in orangutans". American Journal of Physical Anthropology. 114 (4): 331–342. doi:10.1002/ajpa.1045. PMID 11275962.

[52] Van Schaik, CP; van Noordwijk, MA; Wich, SA. (2006). "Innovation in wild Bornean orangutans (Pongo pygmaeus wurmbii)". Behaviour. 143 (7): 839–876. doi:10.1163/156853906778017944.

[53] Russon, AE; Handayani, DP; Kuncoro, P; Ferisa, A. (2007). "Orangutan leaf-carrying for nest-building: toward unraveling cultural processes". Animal Cognition. 10 (2): 189–202. doi:10.1007/s10071-006-0058-z. PMID 17160669.

[Hardus_ME_2009-54] Hardus, ME; Lameira, AR; van Schaik, CP; Wich, SA. (2009). "Tool use in wild orang-utans modifies sound production: a functionally deceptive innovation?". Proceedings of the Royal Society B: Biological Sciences. 276 (1673): 3689–3694. doi:10.1098/rspb.2009.1027.

[Schaik_CP_2003-55] Van Schaik, CP; Ancrenaz, M; Borgen, G; Galdikas, B; Knott, CD; Singleton, I; Suzuki, A; Utami, SS; Merrill, M.; et al. (2003). "Orangutan cultures and the evolution of material culture". Science. 299 (5603): 102–105. doi:10.1126/science.1078004. PMID 12511649. {{cite journal}}: Explicit use of et al. in: |first9= (help)

[56] Shapiro, G. L. (1975). Teaching linguistics concepts to a juvenile orangutan. California State University. Unpublished Masters Thesis.

[57] Shapiro, G. L. (1982). "Sign acquisition in a home-reared/free-ranging orangutan: Comparisons with other signing apes". American Journal of Primatology. 3 (1–4): 121–29. doi:10.1002/ajp.1350030111.

[58] Shapiro, G. L. (1985). Factors influencing the variance in sign learning performance by four juvenile orangutans (PDF) (Thesis). University of Oklahoma.

[NYT_1.29.95-59] Waal, Frans (1995). "The Loneliest of Apes". The New York Times. Retrieved 26 February 2012. {{cite news}}: Unknown parameter |month= ignored (help)

[NGS1075-60] Galdikas-Brindamour, Birutė (1975). "Orangutans, Indonesia's "People of the Forest"". National Geographic Magazine. Vol. 148, no. 4. pp. 444–473. {{cite news}}: Unknown parameter |month= ignored (help)

[61] MacClancy, J.; Fuentes, A. (2010). Centralizing Fieldwork: Critical Perspectives from Primatology, Biological, and Social Anthropology. Berghahn Books. pp. 6–7. ISBN 978-1-84545-690-0.

[WranPete96-62] Wrangham, Richard W; Peterson, Dale (1996). Demonic males : apes and the origins of human violence. Boston: Houghton Mifflin. p. 137. ISBN 978-0-395-69001-7.

[63] ""Beauty and the Beasts" by Carole Jahme". Salon.com. 23 August 2001. Retrieved 27 January 2011.

[IUCN_Pongo_abelii-64] ^ ^a ^b ^c ^d ^e ^f ^g ^h Template:IUCN2010.4

[IUCN_Pongo_pygmaeus-65] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ Template:IUCN2010.4

[66] Cheyne, S. M.; Thompson, C. J.; Phillips, A. C.; Hill, R. M.; Limin, S. H. (2007). "Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia". Primates. 49 (1): 50–56. doi:10.1007/s10329-007-0063-0. PMID 17899314.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[67] "Fires threaten Sumatran orangutans". Al Jazeera. Retrieved 30 March 2012.

[68] "Orangutan Action Plan 2007–2017" (PDF) (in Indonesian). Government of Indonesia. 2007. p. 5. Retrieved 1 May 2010. {{cite web}}: Cite has empty unknown parameter: |trans_title= (help)

[69] "Stop orangutan skull trade". antaranews.com. 7 September 2011. Retrieved 16 January 2012.

[Untamed-70] Patricia L. Miller-Schroeder (2004). Orangutans. The Untamed World. p. 64. ISBN 1-55388-049-8. Retrieved 7 July 2009.

[71] "About BOS Fundation". Samboja lodge. Retrieved 25 March 2012.

[72] "10 Years: Nyaru Menteng 1999–2009" (PDF). Orangutan Protection Foundation.

[73] "Ny projektledare på Nyaru Menteng". savetheorangutan.se. 26 January 2012.

[74] "Sepilok Orang Utan Sanctuary". Tourism Malaysia. Retrieved 30 December 2011.

[75] Martinelli, D. (2010). A Critical Companion to Zoosemiotics: People, Paths, Ideas. Springer. pp. 218–219. ISBN 978-90-481-9248-9.

[76] Australian Department of the Environment and Water Resources. "Tax Deductible Organisations (Register of Environmental Organisations)". Accessed 1 August 2007.

[77] Butler, R.A. (20 August 2009). "Rehabilitation not enough to solve orangutan crisis in Indonesia". mongabay.com.

[78] Marusiak, J. (28 June 2011). "New deal for orangutans in Kalimantan". Eco-Business.com.

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@@ Line 1: / Line 1: @@
+{{Use dmy dates|date=May 2012}}
 {{About|the primate}}
 {{pp-move-indef}}{{pp-semi-indef}}
 {{Taxobox
-| name                   = Orangutans
+| name = Orangutans
-| image                  = Orang Utan, Semenggok Forest Reserve, Sarawak, Borneo, Malaysia.JPG
+| image = Orang Utan, Semenggok Forest Reserve, Sarawak, Borneo, Malaysia.JPG
-| image_caption          = [[Bornean orangutan]] (''Pongo pygmaeus'')
+| image_caption = [[Bornean orangutan]] (''Pongo pygmaeus'')
-| regnum                 = [[Animal]]ia
+| regnum = [[Animal]]ia
-| phylum                 = [[Chordate|Chordata]]
+| phylum = [[Chordate|Chordata]]
-| classis                = [[Mammal]]ia
+| classis = [[Mammal]]ia
-| ordo                   = [[Primates]]
+| ordo = [[Primates]]
-| familia                = [[Hominidae]]
+| familia = [[Hominidae]]
-| subfamilia             = [[Ponginae]]
+| subfamilia = [[Ponginae]]
-| genus                  = '''''Pongo'''''
+| genus = '''''Pongo'''''
-| genus_authority        = [[Bernard Germain Étienne de la Ville, Comte de Lacépède|Lacépède]], 1799
+| genus_authority = [[Bernard Germain Étienne de la Ville, Comte de Lacépède|Lacépède]], 1799
-| type_species           = ''[[Bornean orangutan|Pongo borneo]]''
+| type_species = ''[[Bornean orangutan|Pongo borneo]]''
 | type_species_authority = [[Bernard Germain Étienne de la Ville, Comte de Lacépède|Lacépède]], 1799 (= ''Simia pygmaeus'' Linnaeus, 1760)
-| subdivision_ranks      = [[Species]]
+| subdivision_ranks = [[Species]]
-| subdivision            =
+| subdivision =
 ''[[Bornean orangutan|Pongo pygmaeus]]''<br />
 ''[[Sumatran orangutan|Pongo abelii]]''
 | status =
 | trend =
 | status_system =
 | status_ref =
-| range_map              = Mapa distribuicao pongo.png
+| range_map = Mapa distribuicao pongo.png
-| range_map_caption      = Range of the two orangutan species
+| range_map_caption = Range of the two orangutan species
 | synonyms = ''Faunus'' <small>Oken, 1816</small> <br>
 ''Lophotus'' <small>Fischer, 1813</small> <br>
 ''Macrobates'' <small>Bilberg, 1828</small> <br>
-''Satyrus'' <small>Lesson, 1840</small> <br>
+''Satyrus'' <small>Lesson, 1840</small>
 }}
-The '''orangutans''' are the two exclusively [[Asia]]n [[species]] of [[extant taxon|extant]] [[great ape]]s.  Native to [[Indonesia]] and [[Malaysia]], orangutans are currently found only in the [[rainforest]]s of [[Borneo]] and [[Sumatra]].  Classified in the [[genus]] '''''Pongo''''', orangutans were considered to be one species. However, since 1996, they were divided into two species: the [[Bornean orangutan]] (''P. pygmaeus'') and the [[Sumatran orangutan]] (''P. abelii''). In addition, the Bornean species is divided into three subspecies. The orangutans are also the only surviving species of the subfamily [[Ponginae]], which also included several other species like ''[[Gigantopithecus]]'', the largest known primate. Both species had their genomes sequenced and they appear to have diverged around 400,000&nbsp;years ago.  Orangutans diverged from the rest of the great apes approximately 15.7 to 19.3&nbsp;[[Mya (unit)|mya]] (million years ago).
+The '''orangutans''' are the two exclusively Asian [[species]] of [[extant taxon|extant]] [[great ape]]s. Native to [[Indonesia]] and [[Malaysia]], orangutans are currently found only in the [[rainforest]]s of [[Borneo]] and [[Sumatra]]. Classified in the [[genus]] '''''Pongo''''', orangutans were considered to be one species. However, since 1996, they were divided into two species: the [[Bornean orangutan]] (''P. pygmaeus'') and the [[Sumatran orangutan]] (''P. abelii''). In addition, the Bornean species is divided into three subspecies. The orangutans are also the only surviving species of the subfamily [[Ponginae]], which also included several other species like ''[[Gigantopithecus]]'', the largest known primate. Both species had their genomes sequenced and they appear to have diverged around 400,000&nbsp;years ago. Orangutans diverged from the rest of the great apes approximately 15.7 to 19.3&nbsp;[[Mya (unit)|mya]] (million years ago).
 Orangutans are the most [[Arboreal locomotion|arboreal]] great apes and spend most of their time in trees. Their hair is typically reddish-brown, instead of the brown or black hair typical of [[chimpanzee]]s and [[gorilla]]s. Males and females differ in size and appearance. Dominant adult males have distinctive cheek pads and produce long calls that attract females and intimidate rivals. Younger males do not have these characteristics and resemble adult females. Orangutans are the most solitary of the great apes, with social bonds occurring primarily between mothers and their dependent offspring, who stay together for the first two years. Fruit is the most important component of an orangutan's diet, however, the apes will also eat vegetation, bark, honey, insects and even bird eggs. They can live over 30&nbsp;years in both the wild and captivity.
-Orangutans are among the most intelligent [[primate]]s and use a variety of sophisticated tools, also constructing elaborate sleeping nests each night from branches and foliage. The apes have been extensively studied for their learning abilities. There may even be distinctive [[culture]]s within populations. Field studies of the apes were pioneered by [[Primatology|primatologist]] [[Birutė Galdikas]]. Both orangutan species are considered to be [[endangered species|Endangered]] with the Sumatran orangutan being [[Critically Endangered]]. Human activities have decimated the populations and ranges of both species. Threats to wild orangutan populations include poaching, habitat destruction and the illegal [[Exotic pet|pet trade]]. There are several conservation and rehabilitation organisations dedicated to the survival of orangutans in the wild.
+Orangutans are among the most intelligent [[primate]]s and use a variety of sophisticated tools, also constructing elaborate sleeping nests each night from branches and foliage. The apes have been extensively studied for their learning abilities. There may even be distinctive cultures within populations. Field studies of the apes were pioneered by [[Primatology|primatologist]] [[Birutė Galdikas]]. Both orangutan species are considered to be [[endangered species|Endangered]] with the Sumatran orangutan being [[Critically Endangered]]. Human activities have decimated the populations and ranges of both species. Threats to wild orangutan populations include poaching, habitat destruction and the illegal [[Exotic pet|pet trade]]. There are several conservation and rehabilitation organisations dedicated to the survival of orangutans in the wild.
 ==Etymology==
-The name ''orangutan'' (also written ''orang-utan'', ''orang utan'', ''orangutang'', and ''ourang-outang'') is derived from the [[Malay language|Malay]] and [[Indonesian language|Indonesian]] words ''orang'' meaning "person" and ''hutan'' meaning "forest",<ref>{{cite web| title = "Orangutan" entry in Etymology Online| url = http://www.etymonline.com/index.php?term=orangutan| author= Douglas Harper| accessdate = 2012-05-04}}</ref> thus "person of the forest".<ref name=NG>{{cite web| title = National Geographic| url = http://animals.nationalgeographic.com/animals/mammals/orangutan.html| publisher =  [[National Geographic Society]]| accessdate = 2009-07-25}}</ref> ''Orang Hutan'' was originally not used to refer to apes, but to forest dwelling humans. The Malay words used to refer specifically to the ape is ''maias'' and ''mawas'', but it is unclear if those words refer only to orangutans, or to all apes in general. The first attestation of the word to name the Asian ape is in [[Jacobus Bontius]]' 1631 " ''Historiae naturalis et medicae Indiae orientalis''" - he described that Malaysians had informed him that the ape was able to talk, but preferred not to "lest he be compelled to labour"<ref name="Dellios">Dellios, Paulette. 2008 ''A lexical odyssey from the Malay World.''  Journal of Pidgin and Creole Languages 23:1</ref> The word appeared in several German language descriptions of Indonesian zoology in the 17th century. It has been noted that the likely origin of the word comes specifically from the [[Banjar language|Banjarese]] variety of Malay.<ref name="mahdi">Mahdi, Waruno. 2007. Malay words and Malay things: lexical souvenirs from an exotic archipelago in German publications before 1700. Otto Harrassowitz Verlag, pp 170 - 181</ref>
+The name ''orangutan'' (also written ''orang-utan'', ''orang utan'', ''orangutang'', and ''ourang-outang'') is derived from the [[Malay language|Malay]] and [[Indonesian language|Indonesian]] words ''orang'' meaning "person" and ''hutan'' meaning "forest",<ref>{{cite web| title = "Orangutan" entry in Etymology Online| url = http://www.etymonline.com/index.php?term=orangutan| author= Douglas Harper| accessdate =4 May 2012}}</ref> thus "person of the forest".<ref name=NG>{{cite web| title = National Geographic| url = http://animals.nationalgeographic.com/animals/mammals/orangutan.html| publisher = [[National Geographic Society]]| accessdate =25 July 2009}}</ref> ''Orang Hutan'' was originally not used to refer to apes, but to forest dwelling humans. The Malay words used to refer specifically to the ape is ''maias'' and ''mawas'', but it is unclear if those words refer only to orangutans, or to all apes in general. The first attestation of the word to name the Asian ape is in [[Jacobus Bontius]]' 1631 " ''Historiae naturalis et medicae Indiae orientalis''" - he described that Malaysians had informed him that the ape was able to talk, but preferred not to "lest he be compelled to labour"<ref name="Dellios">Dellios, Paulette. 2008 ''A lexical odyssey from the Malay World.'' Journal of Pidgin and Creole Languages 23:1</ref> The word appeared in several German language descriptions of Indonesian zoology in the 17th century. It has been noted that the likely origin of the word comes specifically from the [[Banjar language|Banjarese]] variety of Malay.<ref name="mahdi">Mahdi, Waruno. 2007. Malay words and Malay things: lexical souvenirs from an exotic archipelago in German publications before 1700. Otto Harrassowitz Verlag, pp 170 - 181</ref>
-The word was first attested in English in 1691 in the form ''orang-outang'', and variants with ''-ng'' instead of ''-n'' as in the Malay original are found in many languages. This spelling (and pronunciation) has remained in use in English up to the present, but has come to be regarded as [[Linguistic prescription|incorrect]].<ref>{{cite web |url=http://www.alphadictionary.com/goodword/word/orangutan |title=Orangutan |publisher=alphadictionary.com |accessdate=2006-12-20}}</ref><ref>Peter Tan (1998). Malay loan words across different dialects of English. English Today, 14 , pp 44-50</ref><ref>Cannon, Garland. 1992. Malay(sian) Borrowings in English, American Speech Vol. 67, No. 2, pp. 134-162</ref> The loss of "h" in Utan and the shift fron n to -ng has been taken to suggest that the language entered English through Portuguese.<ref name="mahdi"/> In 1869 British naturalist [[Alfred Russel Wallace]], co-creator of modern [[Evolutionary theory]] published his account of Malaysia's wildlife: "''The Malay
+The word was first attested in English in 1691 in the form ''orang-outang'', and variants with ''-ng'' instead of ''-n'' as in the Malay original are found in many languages. This spelling (and pronunciation) has remained in use in English up to the present, but has come to be regarded as [[Linguistic prescription|incorrect]].<ref>{{cite web |url=http://www.alphadictionary.com/goodword/word/orangutan |title=Orangutan |publisher=alphadictionary.com |accessdate=20 December 2006}}</ref><ref>Peter Tan (1998). Malay loan words across different dialects of English. English Today, 14 , pp 44-50</ref><ref>Cannon, Garland. 1992. Malay(sian) Borrowings in English, American Speech Vol. 67, No. 2, pp. 134-162</ref> The loss of "h" in Utan and the shift fron n to -ng has been taken to suggest that the language entered English through Portuguese.<ref name="mahdi"/> In 1869 British naturalist [[Alfred Russel Wallace]], co-creator of modern [[Evolutionary theory]] published his account of Malaysia's wildlife: "''The Malay
 Archipelago: The Land of the Orang-Utan and the Bird of Paradise''".<ref name="Dellios"/>
@@ Line 46: / Line 47: @@
 ==Taxonomy, phylogeny and genetics==
-The two orangutan species are the only extant members of the subfamily [[Ponginae]]. This subfamily also included the extinct genera ''[[Lufengpithecus]]'', which lived in southern China and Thailand 2–8&nbsp;mya, and ''[[Sivapithecus]]'', which lived India and Pakistan from 12.5&nbsp;mya until 8.5&nbsp;mya. These [[ape]]s likely lived in drier and cooler environments then orangutans do today. ''[[Khoratpithecus|Khoratpithecus piriyai]]'', which lived in Thailand 5–7&nbsp;mya, is believed to have been the closest known relative of the orangutans. The largest known primate, ''[[Gigantopithecus]]'', was also a member of Ponginae and lived in China, India and Vietnam from 5&nbsp;mya to 100,000&nbsp;years ago.<ref name=Payne/>{{rp|50}}  Within apes (superfamily Hominoidea), the [[gibbon]]s diverged during the early [[Miocene]] (between 19.7 and 24.1&nbsp;mya, according to [[Molecular clock|molecular evidence]]) and the orangutans split from the African great ape lineage between 15.7 and 19.3&nbsp;mya.<ref name=Israfil_et_al>{{cite doi | 10.1016/j.ympev.2010.11.005}}</ref>{{rp|at=Fig. 4}}
+The two orangutan species are the only extant members of the subfamily [[Ponginae]]. This subfamily also included the extinct genera ''[[Lufengpithecus]]'', which lived in southern China and Thailand 2–8&nbsp;mya, and ''[[Sivapithecus]]'', which lived India and Pakistan from 12.5&nbsp;mya until 8.5&nbsp;mya. These [[ape]]s likely lived in drier and cooler environments then orangutans do today. ''[[Khoratpithecus|Khoratpithecus piriyai]]'', which lived in Thailand 5–7&nbsp;mya, is believed to have been the closest known relative of the orangutans. The largest known primate, ''[[Gigantopithecus]]'', was also a member of Ponginae and lived in China, India and Vietnam from 5&nbsp;mya to 100,000&nbsp;years ago.<ref name=Payne/>{{rp|50}} Within apes (superfamily Hominoidea), the [[gibbon]]s diverged during the early [[Miocene]] (between 19.7 and 24.1&nbsp;mya, according to [[Molecular clock|molecular evidence]]) and the orangutans split from the African great ape lineage between 15.7 and 19.3&nbsp;mya.<ref name=Israfil_et_al>{{cite doi | 10.1016/j.ympev.2010.11.005}}</ref>{{rp|at=Fig. 4}}
 {| class="wikitable" style="margin: 1em auto 1em auto" border="1" width="750pt"
@@ Line 64: / Line 65: @@
 |label1=&nbsp;Hominoidea
 |1={{Cladex
-   |1={{Cladex
+ |1={{Cladex
-      |1={{Cladex
+ |1={{Cladex
-         |1={{Cladex
+ |1={{Cladex
-            |1=humans&nbsp;(genus&nbsp;''Homo'')
+ |1=humans&nbsp;(genus&nbsp;''Homo'')
-            |2=chimpanzees&nbsp;(genus&nbsp;''Pan'')
+ |2=chimpanzees&nbsp;(genus&nbsp;''Pan'')
+ }}
-            }}
-         |2=gorillas&nbsp;(genus ''Gorilla'')
+ |2=gorillas&nbsp;(genus ''Gorilla'')
+ }}
-         }}
-      |2='''orangutans&nbsp;(genus ''Pongo'')'''
+ |2='''orangutans&nbsp;(genus ''Pongo'')'''
-      }}
+ }}
-   |2=gibbons&nbsp;(family&nbsp;Hylobatidae)
+ |2=gibbons&nbsp;(family&nbsp;Hylobatidae)
-   }}
+ }}
 }}
 |}
-The populations on the two islands were classified as [[subspecies]] until 1996<ref name=Payne/>{{rp|53}}, when they were elevated to full species status, and the three distinct populations on Borneo were elevated to subspecies. The population currently  listed as ''P.&nbsp;p.&nbsp;wurmbii'' may be closer to the Sumatran orangutan than the other Bornean orangutan subspecies. If confirmed, ''abelii'' would be a subspecies of ''P.&nbsp;wurmbii'' (Tiedeman, 1808).<ref name=Asian>{{cite journal | last1 = Bradon-Jones | first1 = D. | last2 = Eudey | first2 = A. A. | last3 = Geissmann | first3 = T. | last4 = Groves | first4 = C. P. | last5 = Melnick | first5 = D. J. | last6 = Morales | first6 = J. C. | last7 = Shekelle | first7 = M. | last8 = Stewart | first8 = C. B. | year = 2004 | title = Asian primate classification | url = http://www.gibbons.de/main/papers/pdf_files/2004asianprimates.pdf | format=PDF| journal = International Journal of Primatology | volume = 25 | issue = | pages = 97–164 | doi=10.1023/B:IJOP.0000014647.18720.32}}</ref> Regardless, the [[type locality (biology)|type locality]] of ''pygmaeus'' has not been established beyond doubts, and may be from the population currently listed as ''wurmbii'' (in which case ''wurmbii'' would be a [[junior synonym]] of ''pygmaeus'', while one of the names currently considered a junior synonym of ''pygmaeus'' would take precedence for the northwest Bornean [[taxon]]).<ref name=Asian/> To further confuse, the name ''morio'', as well as some suggested junior synonyms,<ref name=MSW3/> may be junior synonyms of the ''pygmaeus'' subspecies, thus leaving the east Bornean populations unnamed.<ref name=Asian/>
+The populations on the two islands were classified as [[subspecies]] until 1996<ref name=Payne/>{{rp|53}}, when they were elevated to full species status, and the three distinct populations on Borneo were elevated to subspecies. The population currently listed as ''P.&nbsp;p.&nbsp;wurmbii'' may be closer to the Sumatran orangutan than the other Bornean orangutan subspecies. If confirmed, ''abelii'' would be a subspecies of ''P.&nbsp;wurmbii'' (Tiedeman, 1808).<ref name=Asian>{{cite journal | last1 = Bradon-Jones | first1 = D. | last2 = Eudey | first2 = A. A. | last3 = Geissmann | first3 = T. | last4 = Groves | first4 = C. P. | last5 = Melnick | first5 = D. J. | last6 = Morales | first6 = J. C. | last7 = Shekelle | first7 = M. | last8 = Stewart | first8 = C. B. | year = 2004 | title = Asian primate classification | url = http://www.gibbons.de/main/papers/pdf_files/2004asianprimates.pdf | format=PDF| journal = International Journal of Primatology | volume = 25 | issue = | pages = 97–164 | doi=10.1023/B:IJOP.0000014647.18720.32}}</ref> Regardless, the [[type locality (biology)|type locality]] of ''pygmaeus'' has not been established beyond doubts, and may be from the population currently listed as ''wurmbii'' (in which case ''wurmbii'' would be a [[junior synonym]] of ''pygmaeus'', while one of the names currently considered a junior synonym of ''pygmaeus'' would take precedence for the northwest Bornean [[taxon]]).<ref name=Asian/> To further confuse, the name ''morio'', as well as some suggested junior synonyms,<ref name=MSW3/> may be junior synonyms of the ''pygmaeus'' subspecies, thus leaving the east Bornean populations unnamed.<ref name=Asian/>
 In addition, some fossils described under the name ''[[Pongo hooijeri|P.&nbsp;hooijeri]]'' have been found in Vietnam, and multiple fossil subspecies have been described from several parts of southeastern Asia. It is unclear if these belong to ''P.&nbsp;pygmaeus'' or ''P.&nbsp;abelii'' or, in fact, represent distinct species.<ref>{{aut|Schwartz, J.H.}}; {{aut|Vu The Long}}; {{aut|Nguyen Lan Cuong}}, {{aut|Le Trung Kha}}; {{aut|Tattersall, I.}} 1995: A review of the Pleistocene hominoid fauna of the Socialist Republic of Vietnam (excluding Hylobatidae). ''Anthropological papers of the American Museum of Natural History'', ('''76'''): 1-24. [http://digitallibrary.amnh.org/dspace/handle/2246/259 Abstract & pdf]</ref>
 ===Genomics===
-The Sumatran orangutan genome was sequenced in January 2011.<ref name="Locke2011">{{cite doi|10.1038/nature09687}}</ref><ref name=nature>{{cite journal | doi=10.1038/news.2011.50 | title=Orang-utans join the genome gang | journal=Nature |last=Singh |first=Ranjeet |url=http://www.nature.com/news/2011/110126/full/news.2011.50.html |date=2011-01-04 |accessdate=2011-01-27}}</ref> Following humans and [[Common chimpanzee|chimpanzees]], the Sumatran orangutan has become the third species of [[hominid]] to have its genome sequenced. Subquently, the Bornean species would have its genome sequenced. It was found that [[genetic diversity]] was lower in Bornean orangutans (''P.&nbsp;pygmaeus'') than in Sumatran ones (''P.&nbsp;abelii''), despite the fact that Borneo is home to six or seven times as many orangutans as Sumatra.<ref name=nature/> The comparison has shown that these two species diverged around 400,000&nbsp;years ago, more recently than was previously thought. It was also found that the orangutan genome has evolved much more slowly than chimpanzee and human DNA.<ref name=nature/>  Previously it was estimated that the species diverged 2.9 to 4.9&nbsp;mya.<ref name=Israfil_et_al/>{{rp|at=Fig. 4}} The researchers hope that these data may help conservationists save the endangered ape, and also prove useful in further understanding of human [[genetic diseases]].<ref name=nature/>
+The Sumatran orangutan genome was sequenced in January 2011.<ref name="Locke2011">{{cite doi|10.1038/nature09687}}</ref><ref name=nature>{{cite journal | doi=10.1038/news.2011.50 | title=Orang-utans join the genome gang | journal=Nature |last=Singh |first=Ranjeet |url=http://www.nature.com/news/2011/110126/full/news.2011.50.html |date=4 January 2011 |accessdate=27 January 2011}}</ref> Following humans and [[Common chimpanzee|chimpanzees]], the Sumatran orangutan has become the third species of [[hominid]] to have its genome sequenced. Subquently, the Bornean species would have its genome sequenced. It was found that [[genetic diversity]] was lower in Bornean orangutans (''P.&nbsp;pygmaeus'') than in Sumatran ones (''P.&nbsp;abelii''), despite the fact that Borneo is home to six or seven times as many orangutans as Sumatra.<ref name=nature/> The comparison has shown that these two species diverged around 400,000&nbsp;years ago, more recently than was previously thought. It was also found that the orangutan genome has evolved much more slowly than chimpanzee and human DNA.<ref name=nature/> Previously it was estimated that the species diverged 2.9 to 4.9&nbsp;mya.<ref name=Israfil_et_al/>{{rp|at=Fig. 4}} The researchers hope that these data may help conservationists save the endangered ape, and also prove useful in further understanding of human [[genetic diseases]].<ref name=nature/>
 Bornean orangutans have 48&nbsp;[[diploid]] [[chromosome]]s.<ref>{{cite web|last=Sharshov|first=Alexander|title=New Page 1|url=http://www.bionet.nsc.ru/labs/chromosomes/maps/orangutan.htm|work=SB RAS Novobrisk|publisher=Institute of Cytology and Genetics|accessdate=28 January 2011}}</ref>
@@ Line 90: / Line 91: @@
 ==Anatomy and physiology==
 [[File:Orang-Utan Tournai.jpg|thumb|upright|The orangutan's skeleton is adapted for its arboreal lifestyle.]]
-An orangutan has a large, bulky body, a thick neck, very long, strong arms, short, bowed legs, and no tail. It is mostly covered with long reddish-brown hair and grey-black skin. Sumatran orangutans have the more sparse and lighter coloured coat.<ref>{{cite web|url=http://www.red-ape.co.uk/orangutan/orang_anatomy.html |title=Orangutan Anatomy Page |publisher=Red-ape.co.uk |date= |accessdate=2009-07-03}}</ref> The orangutan has a large head with a prominent mouth area. Though largely hairless, the face of orangutan can develop some hair in males, giving them a moustache.<ref name=Cawthon/> Adult males have large cheek flaps<ref name=Payne>{{cite book|author=Payne, J; Prundente, C|year=2008|title=Orangutans: Behavior, Ecology and Conservation|publisher=New Holland Publishers|isbn= 0-262-16253-9}}</ref>{{rp|14}} that show their dominance to other males. The cheek flaps are made mostly of fatty tissue and are supported by the musculature of the face.<ref>{{cite journal|author=Winkler, L. A.|year=1989|title=Morphology and relationships of the orangutan fatty cheek pads|journal=American Journal of Primatology|volume=17|issue=4|pages=305–19|doi=10.1002/ajp.1350170405}}</ref> Mature males also have throat pouches that allows them to make loud calls.<ref name=Payne/>{{rp|14}}
+An orangutan has a large, bulky body, a thick neck, very long, strong arms, short, bowed legs, and no tail. It is mostly covered with long reddish-brown hair and grey-black skin. Sumatran orangutans have the more sparse and lighter coloured coat.<ref>{{cite web|url=http://www.red-ape.co.uk/orangutan/orang_anatomy.html |title=Orangutan Anatomy Page |publisher=Red-ape.co.uk |date= |accessdate=3 July 2009}}</ref> The orangutan has a large head with a prominent mouth area. Though largely hairless, the face of orangutan can develop some hair in males, giving them a moustache.<ref name=Cawthon/> Adult males have large cheek flaps<ref name=Payne>{{cite book|author=Payne, J; Prundente, C|year=2008|title=Orangutans: Behavior, Ecology and Conservation|publisher=New Holland Publishers|isbn= 0-262-16253-9}}</ref>{{rp|14}} that show their dominance to other males. The cheek flaps are made mostly of fatty tissue and are supported by the musculature of the face.<ref>{{cite journal|author=Winkler, L. A.|year=1989|title=Morphology and relationships of the orangutan fatty cheek pads|journal=American Journal of Primatology|volume=17|issue=4|pages=305–19|doi=10.1002/ajp.1350170405}}</ref> Mature males also have throat pouches that allows them to make loud calls.<ref name=Payne/>{{rp|14}}
-There is significant [[sexual dimorphism]]: females can grow to around 127&nbsp;cm (4&nbsp;ft 2&nbsp;in) and weigh around {{convert|45.4|kg|lb|abbr=on}} while flanged adult males can reach 175&nbsp;cm (5&nbsp;ft 9&nbsp;in) in height and weigh over {{convert|118|kg|lb|abbr=on}}.<ref>{{cite web | title=Sumatran Orangutan Society | url=http://www.orangutans-sos.org/faq.php | accessdate=2007-04-01 |archiveurl = http://web.archive.org/web/20061114233340/http://www.orangutans-sos.org/faq.php <!-- Bot retrieved archive --> |archivedate = 2006-11-14}}</ref> A male orangutans has an [[arm span]] of about {{convert|2|m|ft|abbr=on}}.<ref name=Payne/>{{rp|14}}
+There is significant [[sexual dimorphism]]: females can grow to around 127&nbsp;cm (4&nbsp;ft 2&nbsp;in) and weigh around {{convert|45.4|kg|lb|abbr=on}} while flanged adult males can reach 175&nbsp;cm (5&nbsp;ft 9&nbsp;in) in height and weigh over {{convert|118|kg|lb|abbr=on}}.<ref>{{cite web | title=Sumatran Orangutan Society | url=http://www.orangutans-sos.org/faq.php | accessdate=1 April 2007 |archiveurl = http://web.archive.org/web/20061114233340/http://www.orangutans-sos.org/faq.php <!-- Bot retrieved archive --> |archivedate = 14 November 2006}}</ref> A male orangutans has an [[arm span]] of about {{convert|2|m|ft|abbr=on}}.<ref name=Payne/>{{rp|14}}
-Orangutan hands are similar to humans' hands; they have four long fingers and an [[opposable thumb]]. However, the joint and tendon arrangement in the orangutans' hands produces two adaptations that are significant for [[arboreal locomotion]]. The resting configuration of the fingers is curved, creating a suspensory hook grip.<ref name="Schwartz2">{{cite book | author = Schwartz, Jeffrey|authorlink=Jeffrey H. Schwartz |url =  | title = Orang-utan Biology | year = 1988 | isbn = 0-19-504371-5 | publisher = Oxford University Press | location = USA}}</ref>{{rp|301}} Additionally, without the use of the thumb, the fingers and hands can grip tightly around objects with a small diameter by resting the tops of the fingers against the inside of the palm, which creates a double-locked grip.<ref name="Schwartz2"/>{{rp|301}}
+Orangutan hands are similar to humans' hands; they have four long fingers and an [[opposable thumb]]. However, the joint and tendon arrangement in the orangutans' hands produces two adaptations that are significant for [[arboreal locomotion]]. The resting configuration of the fingers is curved, creating a suspensory hook grip.<ref name="Schwartz2">{{cite book | author = Schwartz, Jeffrey|authorlink=Jeffrey H. Schwartz |url = | title = Orang-utan Biology | year = 1988 | isbn = 0-19-504371-5 | publisher = Oxford University Press | location = USA}}</ref>{{rp|301}} Additionally, without the use of the thumb, the fingers and hands can grip tightly around objects with a small diameter by resting the tops of the fingers against the inside of the palm, which creates a double-locked grip.<ref name="Schwartz2"/>{{rp|301}}
-Their feet have four long toes and an opposable big toe.<ref name=Payne/>{{rp|15}} Orangutans can grasp things with both their hands and their feet.<ref name=Payne/>{{rp|14}} Their fingers and toes are curved, allowing them to better grip onto branches. Orangutans have less restriction in the movements of their legs than humans since their hips joint have the same flexibility as their shoulder and arm joints.<ref name=Payne/>{{rp|15}} Unlike gorillas and chimpanzees, orangutans are not true knuckle-walkers, and are instead fist-walkers.<ref name="Schwartz">{{cite book | author = Schwartz, Jeffrey|authorlink=Jeffrey H. Schwartz |url =  | title = The Red Ape: Orangutans and Human Origins | year = 1987 | page = 286 | isbn = 0-8133-4064-0 | publisher = Westview Press | location = Cambridge, MA}}</ref>
+Their feet have four long toes and an opposable big toe.<ref name=Payne/>{{rp|15}} Orangutans can grasp things with both their hands and their feet.<ref name=Payne/>{{rp|14}} Their fingers and toes are curved, allowing them to better grip onto branches. Orangutans have less restriction in the movements of their legs than humans since their hips joint have the same flexibility as their shoulder and arm joints.<ref name=Payne/>{{rp|15}} Unlike gorillas and chimpanzees, orangutans are not true knuckle-walkers, and are instead fist-walkers.<ref name="Schwartz">{{cite book | author = Schwartz, Jeffrey|authorlink=Jeffrey H. Schwartz |url = | title = The Red Ape: Orangutans and Human Origins | year = 1987 | page = 286 | isbn = 0-8133-4064-0 | publisher = Westview Press | location = Cambridge, MA}}</ref>
 ==Ecology and behaviour==
-Orangutans live in primary and old secondary forests, particularly [[Dipterocarpaceae|dipterocarp]] forests and [[peat swamp forest]]s. Both species can be found in mountainous and lowland swampy areas. Sumatran orangutans live in elevations as high as 1500&nbsp;m (4921&nbsp;ft), while Bornean orangutans live no higher than 1000&nbsp;m (3281&nbsp;ft).<ref name=Cawthon/> Other habitats used by orangutans include grasslands, cultivated fields, gardens, young secondary forest, and shallow lakes.<ref name= "Galdikas 1988">{{cite journal | last = Galdikas | first = BMF | year = 1988 | title = Orangutan diet, range, and activity at Tanjung Puting, Central Borneo| journal = J Mammal | volume = 9 | issue = 1| pages = 1–35 | doi = 10.1007/BF02740195 }}</ref>  Orangutans are the most arboreal of the great apes, spending nearly all of their time in the trees. Most of the day is spent feeding, resting, and travelling. They start the day feeding for 2–3 hours in the morning. They rest during midday then travel in the late afternoon. When evening arrives, they begin to prepare their nests for the night.<ref name=Cawthon/> Orangutans do not swim, although they have been recorded wading in water.<ref>{{cite thesis|author=Kuliukas, A.|year=2001|title=Bipedal Wading in Hominoidae past and present|degree=[[Master of Science]]|publisher=University College London|url=http://www.riverapes.com/Me/Work/Thesis.PDF}}</ref>
+Orangutans live in primary and old secondary forests, particularly [[Dipterocarpaceae|dipterocarp]] forests and [[peat swamp forest]]s. Both species can be found in mountainous and lowland swampy areas. Sumatran orangutans live in elevations as high as 1500&nbsp;m (4921&nbsp;ft), while Bornean orangutans live no higher than 1000&nbsp;m (3281&nbsp;ft).<ref name=Cawthon/> Other habitats used by orangutans include grasslands, cultivated fields, gardens, young secondary forest, and shallow lakes.<ref name= "Galdikas 1988">{{cite journal | last = Galdikas | first = BMF | year = 1988 | title = Orangutan diet, range, and activity at Tanjung Puting, Central Borneo| journal = J Mammal | volume = 9 | issue = 1| pages = 1–35 | doi = 10.1007/BF02740195 }}</ref> Orangutans are the most arboreal of the great apes, spending nearly all of their time in the trees. Most of the day is spent feeding, resting, and travelling. They start the day feeding for 2–3 hours in the morning. They rest during midday then travel in the late afternoon. When evening arrives, they begin to prepare their nests for the night.<ref name=Cawthon/> Orangutans do not swim, although they have been recorded wading in water.<ref>{{cite thesis|author=Kuliukas, A.|year=2001|title=Bipedal Wading in Hominoidae past and present|degree=[[Master of Science]]|publisher=University College London|url=http://www.riverapes.com/Me/Work/Thesis.PDF}}</ref>
 [[File:Orangutan -Zoologischer Garten Berlin-8a.jpg|thumb|upright|left|Although orangutans may consume leaves, shoots, and even bird eggs, fruit is the most important part of their diet.]]
-The main predators of orangutans are [[tigers]]. Other predators include [[Sunda Clouded Leopard|clouded leopard]]s, [[dhole|wild dogs]] and [[crocodile]]s.<ref name=Cawthon/> The absence of tigers on Borneo may explain why Bornean orangutans can be found on the ground more often than their Sumatran relatives.<ref name= "MacDonald">{{Cite book|author=van Schaik, C.; MacKinnon, J.|contribution=Orangutans|year=2001|title=The Encyclopedia of Mammals|edition= 2nd|editor=MacDonald, D|publisher=Oxford University Press|pages=420–23|isbn=0-87196-871-1}}</ref> Orangutans communicate with various sounds. Male will make long calls, both to attract females and advertise themselves to other males.<ref name= "Utami 2002"/> Both sexes will try to intimidate conspecifics with a series of low guttural noises known collectively as the "rolling call".<ref name=vocal>{{cite web|title=Vocal Repertoire|publisher=Orang Utan Republik Foundation|url=http://www.orangutanrepublik.org/become-aware/orangutan-specifics/vocal-repertoire#|accessdate=March 17, 2012}}</ref> When annoyed, an orangutan will suck in air through pursed lips, which makes a kissing sound and is hence known as the "kiss squeak". Infants make soft hoots when distressed. Orangutans are also known to [[blowing a raspberry|blow a raspberry]].<ref name=vocal/>
+The main predators of orangutans are tigers. Other predators include [[Sunda Clouded Leopard|clouded leopards]], [[dhole|wild dogs]] and [[crocodile]]s.<ref name=Cawthon/> The absence of tigers on Borneo may explain why Bornean orangutans can be found on the ground more often than their Sumatran relatives.<ref name= "MacDonald">{{Cite book|author=van Schaik, C.; MacKinnon, J.|contribution=Orangutans|year=2001|title=The Encyclopedia of Mammals|edition= 2nd|editor=MacDonald, D|publisher=Oxford University Press|pages=420–23|isbn=0-87196-871-1}}</ref> Orangutans communicate with various sounds. Male will make long calls, both to attract females and advertise themselves to other males.<ref name= "Utami 2002"/> Both sexes will try to intimidate conspecifics with a series of low guttural noises known collectively as the "rolling call".<ref name=vocal>{{cite web|title=Vocal Repertoire|publisher=Orang Utan Republik Foundation|url=http://www.orangutanrepublik.org/become-aware/orangutan-specifics/vocal-repertoire#|accessdate=17 March 2012}}</ref> When annoyed, an orangutan will suck in air through pursed lips, which makes a kissing sound and is hence known as the "kiss squeak". Infants make soft hoots when distressed. Orangutans are also known to [[blowing a raspberry|blow a raspberry]].<ref name=vocal/>
 ===Diet===
-Orangutans are opportunistic [[forage]]rs, and their diets vary markedly from month to month.<ref name="international1"/> [[Fruit]] makes up 65–90% of the orangutan diet, and those with sugary or fatty pulp are favoured. [[Ficus]] fruits are commonly eaten and are easy to harvest and digest. Lowland dipterocarp forests are preferred by orangutans because of their plentiful fruit. Bornean orangutans consume at least 317&nbsp;different food items that include young leaves, shoots, bark, [[insect]]s, [[honey]] and [[bird egg]]s.<ref name=Cawthon>{{cite web | author = Cawthon Lang KA | date = 2005-06-13 | title = Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology | url = http://pin.primate.wisc.edu/factsheets/entry/orangutan | accessdate = 2007-10-12}}</ref><ref name="international1">{{cite journal | last = Galdikas | first = Birute M.F. | title = Orangutan Diet, Range, and Activity at Tanjung Puting, Central Borneo | journal = International Journal of Primatology | volume = 9 | year = 1988 | doi = 10.1007/BF02740195 | page = 1 | issue = 1}}</ref>
+Orangutans are opportunistic [[forage]]rs, and their diets vary markedly from month to month.<ref name="international1"/> Fruit makes up 65–90% of the orangutan diet, and those with sugary or fatty pulp are favoured. [[Ficus]] fruits are commonly eaten and are easy to harvest and digest. Lowland dipterocarp forests are preferred by orangutans because of their plentiful fruit. Bornean orangutans consume at least 317&nbsp;different food items that include young leaves, shoots, bark, insects, [[honey]] and [[bird egg]]s.<ref name=Cawthon>{{cite web | author = Cawthon Lang KA | date = 13 June 2005 | title = Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology | url = http://pin.primate.wisc.edu/factsheets/entry/orangutan | accessdate =12 October 2007}}</ref><ref name="international1">{{cite journal | last = Galdikas | first = Birute M.F. | title = Orangutan Diet, Range, and Activity at Tanjung Puting, Central Borneo | journal = International Journal of Primatology | volume = 9 | year = 1988 | doi = 10.1007/BF02740195 | page = 1 | issue = 1}}</ref>
-A decade-long study of urine and faecal samples at the [[Gunung Palung Orangutan Conservation Project]] in [[West Kalimantan]] has shown that orangutans give birth during and after the high fruit season (though not every year), during which they consume various abundant fruits, totaling up to 11,000 calories per day. In the low fruit season they eat whatever fruit is available in addition to tree bark and leaves, with daily intake at only 2,000 calories. Together with a long [[lactation]] period, orangutans also have a long birth interval.<ref>Asrianti, T. (2011). [http://www.thejakartapost.com/news/2011/07/04/for-orangutans-less-food-means-lowered-fertility.html For orangutans, less food means lowered fertility]. ''The Jakarta Post'', July 4, 2011.</ref>
+A decade-long study of urine and faecal samples at the [[Gunung Palung Orangutan Conservation Project]] in [[West Kalimantan]] has shown that orangutans give birth during and after the high fruit season (though not every year), during which they consume various abundant fruits, totaling up to 11,000 calories per day. In the low fruit season they eat whatever fruit is available in addition to tree bark and leaves, with daily intake at only 2,000 calories. Together with a long [[lactation]] period, orangutans also have a long birth interval.<ref>Asrianti, T. (2011). [http://www.thejakartapost.com/news/2011/07/04/for-orangutans-less-food-means-lowered-fertility.html For orangutans, less food means lowered fertility]. ''The Jakarta Post'', 4 July 2011.</ref>
 Orangutans are thought to be the sole fruit disperser for some plant species including the climber species ''[[Strychnos ignatii]]'' which contains the toxic [[alkaloid]] [[strychnine]].<ref>{{cite journal | last = Rijksen | first = H. D.| title = A field study on Sumatran orang utans (''Pongo pygmaeus abelii'', Lesson 1827): Ecology, Behaviour and Conservation | journal = The Quarterly Review of Biology | volume = 53 | issue = 4 | month = December | year = 1978 | page = 493| doi = 10.1086/410942 | jstor=2826733}}</ref> It does not appear to have any effect on orangutans except for excessive [[saliva]] production.<ref>{{cite book|author=Simon, Verne A.|year=2010|title=Adaptations in the Animal Kingdom|publisher=Xlibris Corporation|isbn=1-4500-3364-4|page=102}}</ref>
-[[Geophagy]], the practice of eating soil or rock, has been observed in orangutans. There are three main reasons for this dietary behaviour; for the addition of mineral nutrients to their diet; for the ingestion of clay minerals that can absorb toxic substances; or to treat a disorder such as diarrhoea.<ref>{{cite news | title=Science: Monkeys were the first doctors (Telegraph.co.uk) | url=http://www.telegraph.co.uk/science/science-news/3338047/Science-monkeys-were-the-first-doctors.html | date = 1 April 2008 | work=The Daily Telegraph | location=London | first=Roger | last=Highfield | accessdate=2010-05-20}}</ref>  Orangutans also use plants of the genus ''[[Commelina]]'' as an anti-inflammatory balm.<ref>Matt Walker [http://www.newscientist.com/article/dn14406-wild-orangutans-treat-pain-with-natural-antiinflammatory.html Wild orangutans treat pain with natural anti-inflammatory] ''New Scientist'' 28 July 2008.</ref>
+[[Geophagy]], the practice of eating soil or rock, has been observed in orangutans. There are three main reasons for this dietary behaviour; for the addition of mineral nutrients to their diet; for the ingestion of clay minerals that can absorb toxic substances; or to treat a disorder such as diarrhoea.<ref>{{cite news | title=Science: Monkeys were the first doctors (Telegraph.co.uk) | url=http://www.telegraph.co.uk/science/science-news/3338047/Science-monkeys-were-the-first-doctors.html | date = 1 April 2008 | work=The Daily Telegraph | location=London | first=Roger | last=Highfield | accessdate=20 May 2010}}</ref> Orangutans also use plants of the genus ''[[Commelina]]'' as an anti-inflammatory balm.<ref>Matt Walker [http://www.newscientist.com/article/dn14406-wild-orangutans-treat-pain-with-natural-antiinflammatory.html Wild orangutans treat pain with natural anti-inflammatory] ''New Scientist'' 28 July 2008.</ref>
 ===Social life===
 [[File:Leuser-orangs 09N8683.jpg|thumb| Orangutans are the least social of the great apes, but individuals do commonly interact.]]
-Orangutans live a more solitary lifestyle than the other great apes. Most social bonds occur between adult females and their dependent and weaned offspring. Adult males and independent adolescents of both sexes tend to live alone.<ref name = "Boekhorst 1990">{{cite journal | doi=10.1016/S0003-3472(05)80782-1 | title=Residential status and seasonal movements of wild orang-utans in the Gunung Leuser Reserve (Sumatera, Indonesia) | year=1990 | last1=Teboekhorst | first1=I | last2=Schurmann | first2=C | last3=Sugardjito | first3=J | journal=Animal Behaviour | volume=39 | issue=6 | pages=1098–1109 }}</ref>  Orangutan societies are made up of resident and transient individuals of both sexes. Resident females live with their offspring in defined home ranges that overlap with those of other adult females, who may be their immediate relatives. One to several resident female home ranges are encompassed within the home range of a resident male, who is their main mating partner.<ref name=Cawthon2/> Transient males and females move widely.<ref name = "Boekhorst 1990"/> Orangutans usually travel alone, but they may travel in small groups in their sub-adult years. However this behaviour ends at adulthood. The social structure of the orangutan can be best described as [[solitary but social]]. Interactions between adult females range from friendly, to avoidance to antagonistic. Resident males may have overlapping ranges and interactions between them tend to be hostile.<ref name=Cawthon2>{{cite web | author = Cawthon Lang KA | date = 2005-06-13 | title = Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology | url = http://pin.primate.wisc.edu/factsheets/entry/orangutan | accessdate = 2012-02-19}}</ref>
+Orangutans live a more solitary lifestyle than the other great apes. Most social bonds occur between adult females and their dependent and weaned offspring. Adult males and independent adolescents of both sexes tend to live alone.<ref name = "Boekhorst 1990">{{cite journal | doi=10.1016/S0003-3472(05)80782-1 | title=Residential status and seasonal movements of wild orang-utans in the Gunung Leuser Reserve (Sumatera, Indonesia) | year=1990 | last1=Teboekhorst | first1=I | last2=Schurmann | first2=C | last3=Sugardjito | first3=J | journal=Animal Behaviour | volume=39 | issue=6 | pages=1098–1109 }}</ref> Orangutan societies are made up of resident and transient individuals of both sexes. Resident females live with their offspring in defined home ranges that overlap with those of other adult females, who may be their immediate relatives. One to several resident female home ranges are encompassed within the home range of a resident male, who is their main mating partner.<ref name=Cawthon2/> Transient males and females move widely.<ref name = "Boekhorst 1990"/> Orangutans usually travel alone, but they may travel in small groups in their sub-adult years. However this behaviour ends at adulthood. The social structure of the orangutan can be best described as [[solitary but social]]. Interactions between adult females range from friendly, to avoidance to antagonistic. Resident males may have overlapping ranges and interactions between them tend to be hostile.<ref name=Cawthon2>{{cite web | author = Cawthon Lang KA | date = 13 June 2005 | title = Primate Factsheets: Orangutan (Pongo) Taxonomy, Morphology, & Ecology | url = http://pin.primate.wisc.edu/factsheets/entry/orangutan | accessdate =19 February 2012}}</ref>
-During dispersal, females tend to settle in home ranges that overlap with their mothers. However, they do not seem to have any special social bonds with them.<ref name= "Singleton 2002">{{cite journal | last1 = Singleton | first1 = I | last2 = van Schaik | first2 = CP. | year = 2002 | title = The social organisation of a population of Sumatran orangutans | url = | journal = Folia Primatol | volume = 73 | issue = 1| pages = 1–20 | doi = 10.1159/000060415 | pmid = 12065937 }}</ref> Males disperse much farther from their mothers and enter into a transient phase. This phase lasts until a male can challenge and displace a dominant, resident male from his home range.<ref name= "Delgrado 2000">{{cite journal | last1 = Delgado | first1 = RA Jr. | last2 = van Schaik | first2 = CP. | year = 2000 | title = The behavioral ecology and conservation of the orangutan (Pongo pygmaeus): a tale of two islands | url = | journal = Evol Anthro | volume = 9 | issue = 1| pages = 201–18 | doi = 10.1002/1520-6505(2000)9:5<201::AID-EVAN2>3.0.CO;2-Y }}</ref>  Adult males dominate sub-adult males.<ref name= "Fox 2002">{{cite journal | last1 = Fox | first1 = EA. | year = 2002 | title = Female tactics to reduce sexual harassment in the Sumatran orangutan (''Pongo pygmaeus abelii'') | url = | journal = Behav Ecol Sociobiol | volume = 52 | issue = 2| pages = 93–101 | doi = 10.1007/s00265-002-0495-x }}</ref>  Both resident and transient orangutans aggregate on large fruiting trees to feed. The fruits tend to be abundant, so competition is low and individuals may engage in social interactions.<ref name=Cawthon2/> Orangutans will also form traveling groups with members moving between different food sources.<ref name= "Delgrado 2000"/> These groups tend to be made of only a few individuals. They also tend to be consortships between an adult male and female.<ref name=Cawthon2/>
+During dispersal, females tend to settle in home ranges that overlap with their mothers. However, they do not seem to have any special social bonds with them.<ref name= "Singleton 2002">{{cite journal | last1 = Singleton | first1 = I | last2 = van Schaik | first2 = CP. | year = 2002 | title = The social organisation of a population of Sumatran orangutans | url = | journal = Folia Primatol | volume = 73 | issue = 1| pages = 1–20 | doi = 10.1159/000060415 | pmid = 12065937 }}</ref> Males disperse much farther from their mothers and enter into a transient phase. This phase lasts until a male can challenge and displace a dominant, resident male from his home range.<ref name= "Delgrado 2000">{{cite journal | last1 = Delgado | first1 = RA Jr. | last2 = van Schaik | first2 = CP. | year = 2000 | title = The behavioral ecology and conservation of the orangutan (Pongo pygmaeus): a tale of two islands | url = | journal = Evol Anthro | volume = 9 | issue = 1| pages = 201–18 | doi = 10.1002/1520-6505(2000)9:5<201::AID-EVAN2>3.0.CO;2-Y }}</ref> Adult males dominate sub-adult males.<ref name= "Fox 2002">{{cite journal | last1 = Fox | first1 = EA. | year = 2002 | title = Female tactics to reduce sexual harassment in the Sumatran orangutan (''Pongo pygmaeus abelii'') | url = | journal = Behav Ecol Sociobiol | volume = 52 | issue = 2| pages = 93–101 | doi = 10.1007/s00265-002-0495-x }}</ref> Both resident and transient orangutans aggregate on large fruiting trees to feed. The fruits tend to be abundant, so competition is low and individuals may engage in social interactions.<ref name=Cawthon2/> Orangutans will also form traveling groups with members moving between different food sources.<ref name= "Delgrado 2000"/> These groups tend to be made of only a few individuals. They also tend to be consortships between an adult male and female.<ref name=Cawthon2/>
 ===Nesting===
@@ Line 125: / Line 126: @@
 ===Reproduction and parenting===
-Males mature at around 15&nbsp;years of age, by which time they have fully descended testicles and can reproduce. However they exhibit [[neotony|arrested development]] by not developing the distinctive cheek pads, pronounced throat pouches, long fur or long-calls until they are between 15 and 20&nbsp;years old.<ref name=Cawthon2/> The development of these characteristics depends largely on the absence of a resident male.<ref name= "Hooff 1986">{{cite journal | last1 = Schürmann | first1 = CL | last2 = van Hooff | first2 = JARAM | year = 1986 | title = Reproductive strategies of the orangutan: new data and a reconsideration of existing sociosexual models | url = | journal = Int J Primatol | volume = 7 | issue = 3| pages = 265–87 | doi = 10.1007/BF02736392 }}</ref> Males without them are known as unflanged males in contrast to the more developed flanged males. The transformation from unflanged to flanged can occur very quickly. Unflanged and flanged males have two different mating strategies. Flanged males attract oestrous females with their characteristic long calls.<ref name= "Utami 2002">{{cite journal | last1 = Utami | first1 = SS | last2 = Goossens | first2 = B | last3 = Bruford | first3 = MW | last4 = de Ruiter | first4 = JR | last5 = van Hooff | first5 = JARAM | year = 2002 | title = Male bimaturism and reproductive success in Sumatran orangutans | url = | journal = Behav Ecol | volume = 13 | issue = 5| pages = 643–52 | doi = 10.1093/beheco/13.5.643 }}</ref> Those calls may also suppress development in younger males.<ref name= "Delgrado 2000"/> Unflanged males wander widely in search of oestrous females and upon finding one, will force copulation on her. Both strategies are successful,<ref name= "Utami 2002"/> however females prefer to mate with flanged males and  seek their company for protection against unflanged males.<ref name= "Fox 2002"/> Resident males may form consortships with females that can last days, weeks or months after copulation.<ref name= "Utami 2002"/>
+Males mature at around 15&nbsp;years of age, by which time they have fully descended testicles and can reproduce. However they exhibit [[neotony|arrested development]] by not developing the distinctive cheek pads, pronounced throat pouches, long fur or long-calls until they are between 15 and 20&nbsp;years old.<ref name=Cawthon2/> The development of these characteristics depends largely on the absence of a resident male.<ref name= "Hooff 1986">{{cite journal | last1 = Schürmann | first1 = CL | last2 = van Hooff | first2 = JARAM | year = 1986 | title = Reproductive strategies of the orangutan: new data and a reconsideration of existing sociosexual models | url = | journal = Int J Primatol | volume = 7 | issue = 3| pages = 265–87 | doi = 10.1007/BF02736392 }}</ref> Males without them are known as unflanged males in contrast to the more developed flanged males. The transformation from unflanged to flanged can occur very quickly. Unflanged and flanged males have two different mating strategies. Flanged males attract oestrous females with their characteristic long calls.<ref name= "Utami 2002">{{cite journal | last1 = Utami | first1 = SS | last2 = Goossens | first2 = B | last3 = Bruford | first3 = MW | last4 = de Ruiter | first4 = JR | last5 = van Hooff | first5 = JARAM | year = 2002 | title = Male bimaturism and reproductive success in Sumatran orangutans | url = | journal = Behav Ecol | volume = 13 | issue = 5| pages = 643–52 | doi = 10.1093/beheco/13.5.643 }}</ref> Those calls may also suppress development in younger males.<ref name= "Delgrado 2000"/> Unflanged males wander widely in search of oestrous females and upon finding one, will force copulation on her. Both strategies are successful,<ref name= "Utami 2002"/> however females prefer to mate with flanged males and seek their company for protection against unflanged males.<ref name= "Fox 2002"/> Resident males may form consortships with females that can last days, weeks or months after copulation.<ref name= "Utami 2002"/>
 [[Image:orang2.jpg|thumb|right|Infants cling to their mothers for the first four months.]]
-Female orangutans experience their first ovulatory cycle around 5.8–11.1&nbsp;years. These occur earlier in females with more body fat.<ref name=Cawthon2/> Like other great apes, female orangutans enter a period of infertility during adolescence which may last for 1–4&nbsp;years.<ref name=Cawthon2/> Female orangutans also have a 22–30&nbsp;day menstrual cycle. Gestation lasts for nine months with females giving birth to their first offspring between the ages of 14 and 15&nbsp;years. Female orangutans have eight year intervals between births; the longest interbirth intervals among the great apes.<ref name=Cawthon2/> Unlike many other primates, male orangutans do not seem to practice [[Infanticide (zoology)|infanticide]]. This may be because they cannot ensure that they will sire a female's next offspring because  she does not immediately begin ovulating again after her infant dies.<ref>Beaudrot LH, Kahlenberg SM, Marshall AJ. (2009) "Why male orangutans do not kill infants," ''Behav Ecol Sociobiol'' '''63'''(11):1549–1562. PMID 19701484 {{PMC|2728907}}</ref>
+Female orangutans experience their first ovulatory cycle around 5.8–11.1&nbsp;years. These occur earlier in females with more body fat.<ref name=Cawthon2/> Like other great apes, female orangutans enter a period of infertility during adolescence which may last for 1–4&nbsp;years.<ref name=Cawthon2/> Female orangutans also have a 22–30&nbsp;day menstrual cycle. Gestation lasts for nine months with females giving birth to their first offspring between the ages of 14 and 15&nbsp;years. Female orangutans have eight year intervals between births; the longest interbirth intervals among the great apes.<ref name=Cawthon2/> Unlike many other primates, male orangutans do not seem to practice [[Infanticide (zoology)|infanticide]]. This may be because they cannot ensure that they will sire a female's next offspring because she does not immediately begin ovulating again after her infant dies.<ref>{{cite journal |last=Beaudrot |first=LH |last2=Kahlenberg |first2=SM |last3=Marshall |first3=AJ |year=2009 |title=Why male orangutans do not kill infants |work=Behav Ecol Sociobiol |volume=63 |issue=11 |pages=1549–1562 |PMID=19701484 |PMC=2728907}}</ref>
 Male orangutans play almost no role in raising the young. Females do most of the caring and socializing of the young. A female often has an older offspring with her to help in socializing the infant.<ref name= "Munn 1997">Munn C, Fernandez M. (1997) ''Infant development''. In: ''Orangutan species survival plan husbandry manual'', Sodara C,( ed) Chicago (IL): Orangutan Species Survival Plan. p&nbsp;59–66.</ref> Infant orangutans are completely dependent on their mothers for the first two years of their lives. The mother will carry the infant during traveling, as well as feed it and sleep with it in the same night nest.<ref name=Cawthon2/> For the first four months, the infant is carried on its belly and never relieves physical contact. In the following months, the time a infant spends with its mother decreases.<ref name= "Munn 1997"/> When an orangutan reaches the age of two, its climbing skills improve and will travel through the canopy holding hands with other orangutans, a behaviour known as "buddy travel".<ref name= "Munn 1997"/> Orangutans are juveniles for about two to five years of age and will start to temporarily move away from their mothers.<ref name=Cawthon2/> Juveniles are usually weaned at about four years of age. Adolescent orangutans will socialize with their peers while still having contact with their mothers.<ref name=Cawthon2/>
@@ Line 135: / Line 136: @@
 ==Intelligence==
-Orangutans are among the most intelligent primates. Experiments suggest that they can figure out some [[Object_permanence#Object_permanence_in_animals|invisible displacement problems]] with a representational strategy.<ref>{{cite journal | last1 = Deaner | first1 = RO | last2 = van Schaik | first2 = CP | last3 = Johnson | first3 = V. | year = 2006 | title = Do some taxa have better domain-general cognition than others? A meta-analysis of nonhuman primate studies | url =http://www.epjournal.net/filestore/ep04149196.pdf | format=PDF | journal = Evol Psych | volume = 4 | issue = | pages = 149–196 }}</ref> In addition, [[Zoo Atlanta]] has a touch screen computer where their two Sumatran orangutans play games. Scientists hope that the data they collect from this will help researchers learn about socializing patterns, such as whether they mimic others or learn behaviour from trial and error, and hope the data can point to new conservation strategies.<ref>{{cite web | author = Turner, Dorie | url = http://www.usatoday.com/tech/gaming/2007-04-12-orangutans-games_N.htm | title = Orangutans play video games (for research) at Georgia zoo | date = 2007-04-12 | accessdate = 2007-04-12}}</ref> A 2008 study of two orangutans at the [[Leipzig Zoological Garden|Leipzig Zoo]] showed that orangutans are the first non-human species documented to use 'calculated reciprocity' which involves weighing the costs and benefits of gift exchanges and keeping track of these over time.<ref>{{cite journal|author=Dufour, V.   Pelé, M.;  Neumann, M.;  Thierry, B.;Call, J.|year=2008|title= Calculated reciprocity after all: computation behind token transfers in orang-utans |journal= Biol. Lett |volume=5|issue=2|pages=172–75|doi=10.1098/rsbl.2008.0644}}</ref>
+Orangutans are among the most intelligent primates. Experiments suggest that they can figure out some [[Object permanence#Object permanence in animals|invisible displacement problems]] with a representational strategy.<ref>{{cite journal | last1 = Deaner | first1 = RO | last2 = van Schaik | first2 = CP | last3 = Johnson | first3 = V. | year = 2006 | title = Do some taxa have better domain-general cognition than others? A meta-analysis of nonhuman primate studies | url =http://www.epjournal.net/filestore/ep04149196.pdf | format=PDF | journal = Evol Psych | volume = 4 | issue = | pages = 149–196 }}</ref> In addition, [[Zoo Atlanta]] has a touch screen computer where their two Sumatran orangutans play games. Scientists hope that the data they collect from this will help researchers learn about socializing patterns, such as whether they mimic others or learn behaviour from trial and error, and hope the data can point to new conservation strategies.<ref>{{cite web | author = Turner, Dorie | url = http://www.usatoday.com/tech/gaming/2007-04-12-orangutans-games_N.htm | title = Orangutans play video games (for research) at Georgia zoo | date = 12 April 2007 | accessdate =12 April 2007}}</ref> A 2008 study of two orangutans at the [[Leipzig Zoological Garden|Leipzig Zoo]] showed that orangutans are the first non-human species documented to use 'calculated reciprocity' which involves weighing the costs and benefits of gift exchanges and keeping track of these over time.<ref>{{cite journal|author=Dufour, V. Pelé, M.; Neumann, M.; Thierry, B.;Call, J.|year=2008|title= Calculated reciprocity after all: computation behind token transfers in orang-utans |journal= Biol. Lett |volume=5|issue=2|pages=172–75|doi=10.1098/rsbl.2008.0644}}</ref>
-Orangutans are very technically adept nest builders, making a new nest each evening in only in 5 to 6 minutes and choosing branches which the orangutan knows can support its body weight.<ref>{{cite web |url=http://www.pikiran-rakyat.com/node/184921 |title=Orangutan Sangat Cerdas Soal Konstruksi |date=April 17, 2012}}</ref>
+Orangutans are very technically adept nest builders, making a new nest each evening in only in 5 to 6 minutes and choosing branches which the orangutan knows can support its body weight.<ref>{{cite web |url=http://www.pikiran-rakyat.com/node/184921 |title=Orangutan Sangat Cerdas Soal Konstruksi |date=17 April 2012}}</ref>
 ===Tool use and culture===
 Tool use in orangutans was observed by [[Primatology|primatologist]] [[Birutė Galdikas]] in ex-captive populations.<ref>{{cite journal | last1 = Galdikas | first1 = BMF | year = 1982 | title = Orang-Utan tool use at Tanjung Putting Reserve, Central Indonesian Borneo (Kalimantan Tengah) | url = | journal = J Hum Evol | volume = 10 | issue = | pages = 19–33 |doi=10.1016/S0047-2484(82)80028-6}}</ref> In addition, evidence of sophisticated tool manufacture and use in the wild was reported from a population of orangutans in Suaq Balimbing (''Pongo abelii'') in 1996.<ref>{{cite journal | last1 = Van Schaik | first1 = CP | last2 = Fox | first2 = EA | last3 = Sitompul | first3 = AF. | year = 1996 | title = Manufacture and use of tools in wild Sumatran orangutans – implications or human evolution | url = | journal = Naturwissenschaften | volume = 83 | issue = 4| pages = 186–188 | doi = 10.1007/s001140050271 | pmid = 8643126 }}</ref> These orangutans developed a tool kit for use in foraging that consisted of both insect-extraction tools for use in the hollows of trees and seed-extraction tools for harvesting seeds from hard-husked fruit. The orangutans adjusted their tools according to the nature of the task at hand and preference was given to oral tool use.<ref>Fox EA, Sitompul AF, Van Schaik CP. 1999. Intelligent tool use in wild Sumatran orangutans. In: Parker S, Mitchell RW and Miles HL, editors. The Mentality of Gorillas and Orangutans. Cambridge, UK : Cambridge University Press. p: 99-116</ref> This preference was also found in an experimental study of captive orangutans (''P. pygmaeus'').<ref>{{cite journal | last1 = O'Malley | first1 = RC | last2 = McGrew | first2 = WC. | year = 2000 | title = Oral tool use by captive orangutans (Pongo pygmaeus) | url = | journal = Folia Primatol | volume = 71 | issue = 5| pages = 334–341 | doi = 10.1159/000021756 | pmid = 11093037 }}</ref>
-Primatologist Carel P. van Schaik and biological anthropologist Cheryl D. Knott further investigated tool use in different wild orangutan populations.  They compared geographic variations in tool use related to the processing of ''Neesia'' fruit. The orangutans of Suaq Balimbing (''P. abelii'') were found to be avid users of insect and seed-extraction tools when compared to other wild orangutans.<ref name="Schaik CP 2001">{{cite journal | doi = 10.1002/ajpa.1045 | title = Geographic variation in tool use onNeesia fruits in orangutans | year = 2001 | last1 = Van Schaik | first1 = Carel P. | last2 = Knott | first2 = Cheryl D. | journal = American Journal of Physical Anthropology | volume = 114 | issue = 4 | pages = 331–342 | pmid = 11275962 }}</ref><ref>{{cite journal | last1 = Van Schaik | first1 = CP | last2 = van Noordwijk | first2 = MA | last3 = Wich | first3 = SA. | year = 2006 | title = Innovation in wild Bornean orangutans (Pongo pygmaeus wurmbii) | url = | journal = Behaviour | volume = 143 | issue = 7| pages = 839–876 | doi = 10.1163/156853906778017944 }}</ref> The scientists suggested that these differences are cultural. The orangutans at Suaq Balimbing live in dense groups and are socially tolerant; this creates good conditions for social transmission.<ref name="Schaik CP 2001"/> Further evidence that highly social orangutans are more likely to exhibit cultural behaviours came from a study of leaf-carrying behaviours of ex-captive orangutans that were being rehabilitated on the island of Kaja in Borneo.<ref>{{cite journal | last1 = Russon | first1 = AE | last2 = Handayani | first2 = DP | last3 = Kuncoro | first3 = P | last4 = Ferisa | first4 = A. | year = 2007 | title = Orangutan leaf-carrying for nest-building: toward unraveling cultural processes | url = | journal = Animal Cognition | volume = 10 | issue = 2| pages = 189–202 | doi = 10.1007/s10071-006-0058-z | pmid = 17160669 }}</ref>
+Primatologist Carel P. van Schaik and biological anthropologist Cheryl D. Knott further investigated tool use in different wild orangutan populations. They compared geographic variations in tool use related to the processing of ''Neesia'' fruit. The orangutans of Suaq Balimbing (''P. abelii'') were found to be avid users of insect and seed-extraction tools when compared to other wild orangutans.<ref name="Schaik CP 2001">{{cite journal | doi = 10.1002/ajpa.1045 | title = Geographic variation in tool use onNeesia fruits in orangutans | year = 2001 | last1 = Van Schaik | first1 = Carel P. | last2 = Knott | first2 = Cheryl D. | journal = American Journal of Physical Anthropology | volume = 114 | issue = 4 | pages = 331–342 | pmid = 11275962 }}</ref><ref>{{cite journal | last1 = Van Schaik | first1 = CP | last2 = van Noordwijk | first2 = MA | last3 = Wich | first3 = SA. | year = 2006 | title = Innovation in wild Bornean orangutans (Pongo pygmaeus wurmbii) | url = | journal = Behaviour | volume = 143 | issue = 7| pages = 839–876 | doi = 10.1163/156853906778017944 }}</ref> The scientists suggested that these differences are cultural. The orangutans at Suaq Balimbing live in dense groups and are socially tolerant; this creates good conditions for social transmission.<ref name="Schaik CP 2001"/> Further evidence that highly social orangutans are more likely to exhibit cultural behaviours came from a study of leaf-carrying behaviours of ex-captive orangutans that were being rehabilitated on the island of Kaja in Borneo.<ref>{{cite journal | last1 = Russon | first1 = AE | last2 = Handayani | first2 = DP | last3 = Kuncoro | first3 = P | last4 = Ferisa | first4 = A. | year = 2007 | title = Orangutan leaf-carrying for nest-building: toward unraveling cultural processes | url = | journal = Animal Cognition | volume = 10 | issue = 2| pages = 189–202 | doi = 10.1007/s10071-006-0058-z | pmid = 17160669 }}</ref>
 Wild orangutans (''P. pygmaeus wurmbii'') in Tuanan, Borneo, were reported to use tools in acoustic communication.<ref name="Hardus ME 2009">{{cite journal | last1 = Hardus | first1 = ME | last2 = Lameira | first2 = AR | last3 = van Schaik | first3 = CP | last4 = Wich | first4 = SA. | year = 2009 | title = Tool use in wild orang-utans modifies sound production: a functionally deceptive innovation? | url = | journal = Proceedings of the Royal Society B: Biological Sciences | volume = 276 | issue = 1673| pages = 3689–3694 | doi = 10.1098/rspb.2009.1027 }}</ref> They use leaves to amplify the kiss squeak sounds that they produce. Some have suggested that the apes employ this method of amplification in order to deceive the listener into believing that they are larger animals.<ref name="Hardus ME 2009"/>
@@ Line 153: / Line 154: @@
 ==Orangutans and humans==
 {{see also|Orangutans in popular culture}}
-Orangutans were known to the native people of Sumatra and Borneo for millennia. While some communities hunted them for food and decoration, others placed taboos on such practices.<ref name=Payne/>{{rp|66}} In central Borneo, some traditional folk beliefs consider it bad luck to look in the face of an orangutan. Some folk tales involve orangutans mating with and kidnapping humans.<ref name=Payne/>{{rp|68}} There are even stories of hunters being seduced by female orangutans.<ref name=Payne/>{{rp|71}} Europeans became aware of the existence of the orangutan possibly as early as the 17th&nbsp;century.<ref name=Payne/>{{rp|68}} European explorers in Borneo hunted orangutans extensively during the 19th century.<ref name=Payne/>{{rp|65}} The first accurate description of orangutans was given by Dutch anatomist [[Petrus Camper]], who observed the animals and dissected some specimens.<ref name=Payne/>{{rp|64}} However, little was known about orangutans until the field studies of Birutė Galdikas,<ref name="NYT 1.29.95">{{Cite news | last = de Waal | first = Frans | year = 1995  | month = January | title = The Loneliest of Apes | url = http://www.nytimes.com/1995/01/29/books/the-loneliest-of-apes.html?scp=3&sq=galdikas%20fossey%20goodall&st=cse | periodical = [[The New York Times]] | accessdate = 2012-02-26 | pages =  }}</ref> who became a leading authority on the apes.<ref name="NGS1075">{{Cite news | last = Galdikas-Brindamour | first = Birutė  | year = 1975 | month = October | title = Orangutans, Indonesia's "People of the Forest" | periodical = [[National Geographic Magazine]] | volume = 148 | issue = 4 | pages = 444–473 }}</ref>
+Orangutans were known to the native people of Sumatra and Borneo for millennia. While some communities hunted them for food and decoration, others placed taboos on such practices.<ref name=Payne/>{{rp|66}} In central Borneo, some traditional folk beliefs consider it bad luck to look in the face of an orangutan. Some folk tales involve orangutans mating with and kidnapping humans.<ref name=Payne/>{{rp|68}} There are even stories of hunters being seduced by female orangutans.<ref name=Payne/>{{rp|71}} Europeans became aware of the existence of the orangutan possibly as early as the 17th&nbsp;century.<ref name=Payne/>{{rp|68}} European explorers in Borneo hunted orangutans extensively during the 19th century.<ref name=Payne/>{{rp|65}} The first accurate description of orangutans was given by Dutch anatomist [[Petrus Camper]], who observed the animals and dissected some specimens.<ref name=Payne/>{{rp|64}} However, little was known about orangutans until the field studies of Birutė Galdikas,<ref name="NYT 1.29.95">{{Cite news | last = de Waal | first = Frans | year = 1995 | month = January | title = The Loneliest of Apes | url = http://www.nytimes.com/1995/01/29/books/the-loneliest-of-apes.html?scp=3&sq=galdikas%20fossey%20goodall&st=cse | periodical = [[The New York Times]] | accessdate =26 February 2012 | pages = }}</ref> who became a leading authority on the apes.<ref name="NGS1075">{{Cite news | last = Galdikas-Brindamour | first = Birutė | year = 1975 | month = October | title = Orangutans, Indonesia's "People of the Forest" | periodical = [[National Geographic Magazine]] | volume = 148 | issue = 4 | pages = 444–473 }}</ref>
-When she arrived in Borneo, Galdikas settled into a primitive bark and thatch hut, at a site she dubbed [[Camp Leakey]], near the edge of the [[Java Sea]].<ref name="NGS1075" />  Despite numerous hardships, she remained there for over 30 years and became an outspoken advocate for orangutans and the preservation of their rainforest habitat, which is rapidly being devastated by [[logging industry|logger]]s, [[palm oil]] plantations, [[gold miner]]s, and unnatural [[Wildfire|forest fires]]. Galdikas's [[conservation biology|conservation]] efforts have extended well beyond advocacy, largely focusing on [[rehabilitation (wildlife)|rehabilitation]] of the many orphaned orangutans turned over to her for care.<ref name="NGS1075" /> Galdikas is considered to be one of [[Leakey's Angels]], along with [[Jane Goodall]] and [[Dian Fossey]].<ref>{{cite book | last1 = MacClancy | first1 = J. | last2 = Fuentes | first2 = A. | title = Centralizing Fieldwork: Critical Perspectives from Primatology, Biological, and Social Anthropology | year = 2010 | publisher = Berghahn Books | pages = 6–7 | isbn = 978-1-84545-690-0 | url = http://books.google.com/books?id=zSTT5Ntj9y0C&pg=PA6}}</ref>
+When she arrived in Borneo, Galdikas settled into a primitive bark and thatch hut, at a site she dubbed [[Camp Leakey]], near the edge of the [[Java Sea]].<ref name="NGS1075" /> Despite numerous hardships, she remained there for over 30 years and became an outspoken advocate for orangutans and the preservation of their rainforest habitat, which is rapidly being devastated by [[logging industry|loggers]], [[palm oil]] plantations, [[gold miner]]s, and unnatural [[Wildfire|forest fires]]. Galdikas's [[conservation biology|conservation]] efforts have extended well beyond advocacy, largely focusing on [[rehabilitation (wildlife)|rehabilitation]] of the many orphaned orangutans turned over to her for care.<ref name="NGS1075" /> Galdikas is considered to be one of [[Leakey's Angels]], along with [[Jane Goodall]] and [[Dian Fossey]].<ref>{{cite book | last1 = MacClancy | first1 = J. | last2 = Fuentes | first2 = A. | title = Centralizing Fieldwork: Critical Perspectives from Primatology, Biological, and Social Anthropology | year = 2010 | publisher = Berghahn Books | pages = 6–7 | isbn = 978-1-84545-690-0 | url = http://books.google.com/books?id=zSTT5Ntj9y0C&pg=PA6}}</ref>
-Male orangutans have been reported to display sexual attraction to human women to the point of [[rape]]. The cook of noted primatologist Birutė Galdikas was raped by an orangutan.<ref name=WranPete96>{{Cite book |last=Wrangham |first=Richard W |last2=Peterson |first2=Dale |year=1996 |title=Demonic males : apes and the origins of human violence |publication-place=Boston |publisher=Houghton Mifflin |isbn=978-0-395-69001-7 | page = 137}}</ref>  According to reporter Carole Jahme, rape "was almost the fate of [[Julia Roberts]]" when she was seized by a male orangutan before being freed by the film crew.<ref>{{cite web|url=http://www.salon.com/2001/08/23/primates/singleton/ |title="Beauty and the Beasts" by Carole Jahme |publisher=Salon.com |date=2001-08-23 |accessdate=2011-01-27}}</ref>
+Male orangutans have been reported to display sexual attraction to human women to the point of rape. The cook of noted primatologist Birutė Galdikas was raped by an orangutan.<ref name=WranPete96>{{Cite book |last=Wrangham |first=Richard W |last2=Peterson |first2=Dale |year=1996 |title=Demonic males : apes and the origins of human violence |publication-place=Boston |publisher=Houghton Mifflin |isbn=978-0-395-69001-7 | page = 137}}</ref> According to reporter Carole Jahme, rape "was almost the fate of [[Julia Roberts]]" when she was seized by a male orangutan before being freed by the film crew.<ref>{{cite web|url=http://www.salon.com/2001/08/23/primates/singleton/ |title="Beauty and the Beasts" by Carole Jahme |publisher=Salon.com |date=23 August 2001 |accessdate=27 January 2011}}</ref>
 ==Conservation==
 ===Conservation status===
-The Sumatran species is critically endangered<ref name="IUCN Pongo abelii">{{IUCN2010.4 |assessors= Singleton, I., Wich, S.A. & Griffiths, M.|year= 2008|id= 39780|title= Pongo abelii|downloaded= 28 Jan. 2011}}</ref> and the Bornean species of orangutan is endangered<ref name="IUCN Pongo pygmaeus">{{IUCN2010.4 |assessors= Ancrenaz, M., Marshall, A., Goossens, B., van Schaik, C., Sugardjito, J., Gumal, M. & Wich, S.|year= 2008|id= 17975|title= Pongo pygmaeus|downloaded= 28 Jan. 2011}}</ref> according to the [[IUCN Red List]] of [[mammal]]s, and both are listed on Appendix I of [[CITES]].<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> The Bornean orangutan population declined by 50% in the past 60 years. Its range has become patchy throughout Borneo: being largely [[extirpated]] form various parts of the island, including the south-east.<ref name="IUCN Pongo pygmaeus"/> The largest remaining population is found in the forest around the [[Sabangau River]], but this environment is at risk.<ref>{{cite journal|author=Cheyne, S. M.; Thompson, C. J.; Phillips, A. C.; Hill, R. M.; Limin, S. H.|year=2007|title=Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia|journal=Primates|volume=49|issue=1|pages=50–56|doi=10.1007/s10329-007-0063-0|pmid=17899314}}</ref> Sumatran orangutan populations declined by 80% in 75 years.<ref name="IUCN Pongo abelii"/> This species is now found only in the northern part of Sumatra, with most of the population inhabiting the [[Leuser Ecosystem]].<ref name="IUCN Pongo abelii"/> In late March 2012 it was reported that some of the last Sumatran orangutans in northern Sumatra were threatened with approaching forest fires and might be wiped out entirely within a matter of weeks.<ref>{{cite web|title=Fires threaten Sumatran orangutans|publisher=[[Al Jazeera]]|url=http://www.aljazeera.com/news/asia-pacific/2012/03/201232983425863276.html|accessdate=2012-03-30}}</ref>
+The Sumatran species is critically endangered<ref name="IUCN Pongo abelii">{{IUCN2010.4 |assessors= Singleton, I., Wich, S.A. & Griffiths, M.|year= 2008|id= 39780|title= Pongo abelii|downloaded= 28 Jan 2011}}</ref> and the Bornean species of orangutan is endangered<ref name="IUCN Pongo pygmaeus">{{IUCN2010.4 |assessors= Ancrenaz, M., Marshall, A., Goossens, B., van Schaik, C., Sugardjito, J., Gumal, M. & Wich, S.|year= 2008|id= 17975|title= Pongo pygmaeus|downloaded= 28 Jan 2011}}</ref> according to the [[IUCN Red List]] of [[mammal]]s, and both are listed on Appendix I of [[CITES]].<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> The Bornean orangutan population declined by 50% in the past 60 years. Its range has become patchy throughout Borneo: being largely [[extirpated]] form various parts of the island, including the south-east.<ref name="IUCN Pongo pygmaeus"/> The largest remaining population is found in the forest around the [[Sabangau River]], but this environment is at risk.<ref>{{cite journal|author=Cheyne, S. M.; Thompson, C. J.; Phillips, A. C.; Hill, R. M.; Limin, S. H.|year=2007|title=Density and population estimate of gibbons (Hylobates albibarbis) in the Sabangau catchment, Central Kalimantan, Indonesia|journal=Primates|volume=49|issue=1|pages=50–56|doi=10.1007/s10329-007-0063-0|pmid=17899314}}</ref> Sumatran orangutan populations declined by 80% in 75 years.<ref name="IUCN Pongo abelii"/> This species is now found only in the northern part of Sumatra, with most of the population inhabiting the [[Leuser Ecosystem]].<ref name="IUCN Pongo abelii"/> In late March 2012 it was reported that some of the last Sumatran orangutans in northern Sumatra were threatened with approaching forest fires and might be wiped out entirely within a matter of weeks.<ref>{{cite web|title=Fires threaten Sumatran orangutans|publisher=[[Al Jazeera]]|url=http://www.aljazeera.com/news/asia-pacific/2012/03/201232983425863276.html|accessdate=30 March 2012}}</ref>
-Estimates between 2000 and 2003 found that 7,300&nbsp;Sumatran orangutans<ref name="IUCN Pongo abelii"/> and between 45,000 and 69,000&nbsp;Bornean orangutans<ref name="IUCN Pongo pygmaeus"/> remain in the wild. A 2007 study by the [[Government of Indonesia]] noted in 2004 it was estimated that there was a total wild population of 61,234&nbsp;orangutans, 54,567 of which were found on the island of Borneo. The table below shows a breakdown of the species and subspecies and their estimated populations from the report:<ref>{{cite web |url=  http://www.yorku.ca/arusson/Papers/GoI%20OU%20action%20plan%2007-17.pdf|title= Orangutan Action Plan 2007–2017|year= 2007 |publisher= Government of Indonesia|page= 5|language=Indonesian |trans_title= |format= PDF|accessdate= 1 May 2010}}</ref>
+Estimates between 2000 and 2003 found that 7,300&nbsp;Sumatran orangutans<ref name="IUCN Pongo abelii"/> and between 45,000 and 69,000&nbsp;Bornean orangutans<ref name="IUCN Pongo pygmaeus"/> remain in the wild. A 2007 study by the [[Government of Indonesia]] noted in 2004 it was estimated that there was a total wild population of 61,234&nbsp;orangutans, 54,567 of which were found on the island of Borneo. The table below shows a breakdown of the species and subspecies and their estimated populations from the report:<ref>{{cite web |url= http://www.yorku.ca/arusson/Papers/GoI%20OU%20action%20plan%2007-17.pdf|title= Orangutan Action Plan 2007–2017|year= 2007 |publisher= Government of Indonesia|page= 5|language=Indonesian |trans_title= |format= PDF|accessdate=1 May 2010}}</ref>
 {|class="wikitable"
 |-
-!  style="background:#e3e3e3; width:120px;"| Scientific <br>name
+! style="background:#e3e3e3; width:120px;"| Scientific <br>name
-!  style="background:#e3e3e3; width:200px;"| Common<br> name
+! style="background:#e3e3e3; width:200px;"| Common<br> name
 ! style="background:#e3e3e3;" | Region
 ! style="background:#e3e3e3;" | Estimated<br> number
@@ Line 203: / Line 204: @@
 |}
 [[File:Orangutans.ogg|thumb|Video of Orangutans at a rehabilitation centre in Borneo]]
-During the early 2000s, orangutan habitat has decreased rapidly due to logging and forest fires, as well as [[Habitat fragmentation|fragmentation]] by roads.<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> A major factor in that period of time has been the conversion of vast areas of [[tropical forest]] to [[oil palm]] [[plantation]]s in response to international demand. Palm oil is used for cooking, cosmetics, mechanics, and [[biodiesel]].<ref name="IUCN Pongo pygmaeus"/> There is also a major problem with hunting<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> and the illegal [[Exotic pet|pet trade]].<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> Orangutans may be killed for the [[bushmeat]] trade, crop protection or for use for traditional medicine. Orangutan bones are secretly traded in souvenir shops in several cities in Kalimantan, Indonesia.<ref>{{cite web |url=http://www.antaranews.com/en/news/75425/stop-orangutan-skull-trade |title=Stop orangutan skull trade |publisher=antaranews.com |date=September 7, 2011 |accessdate=2012-01-16}}</ref> Mother orangutans are killed so their infants can be sold as pets, and many of these infants die without the help of their mother.<ref name="Untamed">{{cite book|url=http://books.google.com/?id=EOb5Ca5DjTQC&lpg=PP1&dq=Orangutans&pg=PP1#v=onepage&q=|title = Orangutans|author = Patricia L. Miller-Schroeder|publisher = The Untamed World|page = 64|year= 2004|isbn = 1-55388-049-8 |accessdate = 2009-07-07}}</ref> Since 2004, several pet orangutans were confiscated by local authorities and sent to rehabilitation centres.<ref name="IUCN Pongo pygmaeus"/>
+During the early 2000s, orangutan habitat has decreased rapidly due to logging and forest fires, as well as [[Habitat fragmentation|fragmentation]] by roads.<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> A major factor in that period of time has been the conversion of vast areas of [[tropical forest]] to [[oil palm]] [[plantation]]s in response to international demand. Palm oil is used for cooking, cosmetics, mechanics, and [[biodiesel]].<ref name="IUCN Pongo pygmaeus"/> There is also a major problem with hunting<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> and the illegal [[Exotic pet|pet trade]].<ref name="IUCN Pongo abelii"/><ref name="IUCN Pongo pygmaeus"/> Orangutans may be killed for the [[bushmeat]] trade, crop protection or for use for traditional medicine. Orangutan bones are secretly traded in souvenir shops in several cities in Kalimantan, Indonesia.<ref>{{cite web |url=http://www.antaranews.com/en/news/75425/stop-orangutan-skull-trade |title=Stop orangutan skull trade |publisher=antaranews.com |date=7 September 2011 |accessdate=16 January 2012}}</ref> Mother orangutans are killed so their infants can be sold as pets, and many of these infants die without the help of their mother.<ref name="Untamed">{{cite book|url=http://books.google.com/?id=EOb5Ca5DjTQC&lpg=PP1&dq=Orangutans&pg=PP1#v=onepage&q=|title = Orangutans|author = Patricia L. Miller-Schroeder|publisher = The Untamed World|page = 64|year= 2004|isbn = 1-55388-049-8 |accessdate =7 July 2009}}</ref> Since 2004, several pet orangutans were confiscated by local authorities and sent to rehabilitation centres.<ref name="IUCN Pongo pygmaeus"/>
 ===Conservation centres and organisations===
-A number of organisations are working for the rescue, rehabilitation and reintroduction of orangutans. The largest of these is the [[Borneo Orangutan Survival]] Foundation, founded by conservationist [[Willie Smits]]. It is audited by a multinational auditor company<ref>{{cite web|title=About BOS Fundation|url=http://www.sambojalodge.com/AboutBOSFoundation/|publisher=Samboja lodge|accessdate=March 25, 2012}}</ref>  and operates a number of large projects, such as the [[Nyaru Menteng]] Rehabilitation Program founded by conservationist [[Lone Drøscher Nielsen]].<ref>{{cite web | title = 10 Years: Nyaru Menteng 1999–2009 | publisher = Orangutan Protection Foundation | url = http://savetheorangutan.org/splash/nm10.pdf | format = PDF}}</ref><ref>{{cite web | title = Ny projektledare på Nyaru Menteng | publisher = savetheorangutan.se | date = 26 January 2012 | url = http://www.savetheorangutan.se/about-us/news/ny-projektledare-paa-nyaru-menteng/}}</ref>
+A number of organisations are working for the rescue, rehabilitation and reintroduction of orangutans. The largest of these is the [[Borneo Orangutan Survival]] Foundation, founded by conservationist [[Willie Smits]]. It is audited by a multinational auditor company<ref>{{cite web|title=About BOS Fundation|url=http://www.sambojalodge.com/AboutBOSFoundation/|publisher=Samboja lodge|accessdate=25 March 2012}}</ref> and operates a number of large projects, such as the [[Nyaru Menteng]] Rehabilitation Program founded by conservationist [[Lone Drøscher Nielsen]].<ref>{{cite web | title = 10 Years: Nyaru Menteng 1999–2009 | publisher = Orangutan Protection Foundation | url = http://savetheorangutan.org/splash/nm10.pdf | format = PDF}}</ref><ref>{{cite web | title = Ny projektledare på Nyaru Menteng | publisher = savetheorangutan.se | date = 26 January 2012 | url = http://www.savetheorangutan.se/about-us/news/ny-projektledare-paa-nyaru-menteng/}}</ref>
-Other major conservation centres in Indonesia include those at [[Kumai District#Tanjung Puting National Park|Tanjung Puting National Park]] and [[Sebangau National Park]] in [[Central Kalimantan]], [[Kutai]] in [[East Kalimantan]], [[Gunung Palung National Park]] in West Kalimantan, and [[Bukit Lawang]] in the [[Gunung Leuser National Park]] on the border of [[Aceh]] and [[North Sumatra]]. In Malaysia, conservation areas include [[Semenggoh Wildlife Centre]] in Sarawak and [[Matang Wildlife Centre]] also in Sarawak, and the [[Sepilok Orang Utan Sanctuary]] near [[Sandakan]] in Sabah.<ref>{{cite web |url=http://www.tourism.gov.my/destinations/detail.php?theme=AD&map_code=sepilok&state=sabah |accessdate=2011-12-30 |title=Sepilok Orang Utan Sanctuary |publisher=[[Tourism Malaysia]]}}</ref> Major conservation centres that are headquartered outside of the orangutan's home countries; include [[Orangutan Foundation International]], which was founded by Birutė Galdikas,<ref>{{cite book | last1 = Martinelli | first1 = D. | title = A Critical Companion to Zoosemiotics: People, Paths, Ideas | publisher = Springer | year = 2010 | pages = 218–219 | isbn = 978-90-481-9248-9 | url = http://books.google.com/books?id=mDPr7gVnXi4C&pg=PT485}}</ref> and the [[Australian Orangutan Project]].<ref>Australian Department of the Environment and Water Resources. [http://www.environment.gov.au/tax/reo/index.html "Tax Deductible Organisations (Register of Environmental Organisations)"]. Accessed 1 August 2007.</ref>
+Other major conservation centres in Indonesia include those at [[Kumai District#Tanjung Puting National Park|Tanjung Puting National Park]] and [[Sebangau National Park]] in [[Central Kalimantan]], [[Kutai]] in [[East Kalimantan]], [[Gunung Palung National Park]] in West Kalimantan, and [[Bukit Lawang]] in the [[Gunung Leuser National Park]] on the border of [[Aceh]] and [[North Sumatra]]. In Malaysia, conservation areas include [[Semenggoh Wildlife Centre]] in Sarawak and [[Matang Wildlife Centre]] also in Sarawak, and the [[Sepilok Orang Utan Sanctuary]] near [[Sandakan]] in Sabah.<ref>{{cite web |url=http://www.tourism.gov.my/destinations/detail.php?theme=AD&map_code=sepilok&state=sabah |accessdate=30 December 2011 |title=Sepilok Orang Utan Sanctuary |publisher=[[Tourism Malaysia]]}}</ref> Major conservation centres that are headquartered outside of the orangutan's home countries; include [[Orangutan Foundation International]], which was founded by Birutė Galdikas,<ref>{{cite book | last1 = Martinelli | first1 = D. | title = A Critical Companion to Zoosemiotics: People, Paths, Ideas | publisher = Springer | year = 2010 | pages = 218–219 | isbn = 978-90-481-9248-9 | url = http://books.google.com/books?id=mDPr7gVnXi4C&pg=PT485}}</ref> and the [[Australian Orangutan Project]].<ref>Australian Department of the Environment and Water Resources. [http://www.environment.gov.au/tax/reo/index.html "Tax Deductible Organisations (Register of Environmental Organisations)"]. Accessed 1 August 2007.</ref>
-Conservation organisations such as [[Orangutan Land Trust]] work with the palm oil industry to improve [[sustainability]] and encourages the industry to establish [[conservation area]]s for orangutans.<ref>{{cite web | last1 = Butler | first1 = R.A. | title = Rehabilitation not enough to solve orangutan crisis in Indonesia | date = 20 August 2009 | url = http://news.mongabay.com/2009/0820-orangutans.html | publisher = mongabay.com}}</ref>  It works to bring different stakeholders together to achieve conservation of the species and its habitat.<ref>{{cite web | last1 = Marusiak | first1 = J. | title = New deal for orangutans in Kalimantan | publisher = Eco-Business.com | date = 28 June 2011 | url = http://www.eco-business.com/features/new-deal-for-orangutans-in-kalimantan/}}</ref>
+Conservation organisations such as [[Orangutan Land Trust]] work with the palm oil industry to improve [[sustainability]] and encourages the industry to establish [[conservation area]]s for orangutans.<ref>{{cite web | last1 = Butler | first1 = R.A. | title = Rehabilitation not enough to solve orangutan crisis in Indonesia | date = 20 August 2009 | url = http://news.mongabay.com/2009/0820-orangutans.html | publisher = mongabay.com}}</ref> It works to bring different stakeholders together to achieve conservation of the species and its habitat.<ref>{{cite web | last1 = Marusiak | first1 = J. | title = New deal for orangutans in Kalimantan | publisher = Eco-Business.com | date = 28 June 2011 | url = http://www.eco-business.com/features/new-deal-for-orangutans-in-kalimantan/}}</ref>
 ==References==

v t e Apes
Extant ape species	Homo Human (H. sapiens) Pan Bonobo (P. paniscus) Chimpanzee (P. troglodytes) Gorilla Eastern gorilla (G. beringei) Western gorilla (G. gorilla) Orangutan Sumatran orangutan (P. abelii) Bornean orangutan (P. pygmaeus) Tapanuli orangutan (P. tapanuliensis) Gibbon (family: Hylobatidae)
Study of apes	Great ape language Dian Fossey Birutė Galdikas Jane Goodall Chimpanzee genome project Human Genome Project Gladys Kalema-Zikusoka Neanderthal genome project Willie Smits Lone Drøscher Nielsen Ian Redmond Elgin Center Iowa Primate Learning Sanctuary Borneo Orangutan Survival Primate archaeology
Legal and social status	Personhood Research ban Kinshasa Declaration on Great Apes Great Ape Project Great Apes Survival Partnership International Primate Day Nonhuman Rights Project
Related	Primate List of individual apes (non-human) Apes in space (non-human) Bigfoot Bushmeat Chimpanzee–human last common ancestor Gorilla–human last common ancestor Orangutan–human last common ancestor Gibbon–human last common ancestor List of fictional primates (non-human) Great apes Human evolution Monkey Day Mythic humanoids Yeren Yeti Yowie
Category