Temporal range: Eocene – Holocene, 54–0 Ma
|Range of parrots, all species (red)|
Parrots, also known as psittacines //, are birds of the roughly 393 species in 92 genera that make up the order Psittaciformes, found in most tropical and subtropical regions. The order is subdivided into three superfamilies: the Psittacoidea ("true" parrots), the Cacatuoidea (cockatoos), and the Strigopoidea (New Zealand parrots). Parrots have a generally pantropical distribution with several species inhabiting temperate regions in the Southern Hemisphere, as well. The greatest diversity of parrots is in South America and Australasia.
Characteristic features of parrots include a strong, curved bill, an upright stance, strong legs, and clawed zygodactyl feet. Many parrots are vividly coloured, and some are multi-coloured. Most parrots exhibit little or no sexual dimorphism in the visual spectrum. They form the most variably sized bird order in terms of length. The most important components of most parrots' diets are seeds, nuts, fruit, buds, and other plant material. A few species sometimes eat animals and carrion, while the lories and lorikeets are specialised for feeding on floral nectar and soft fruits. Almost all parrots nest in tree hollows (or nest boxes in captivity), and lay white eggs from which hatch altricial (helpless) young.
Parrots, along with ravens, crows, jays, and magpies, are among the most intelligent birds, and the ability of some species to imitate human voices enhances their popularity as pets. Some parrots are intelligent and talk at the level of a four-to-five year old human. Trapping wild parrots for the pet trade, as well as hunting, habitat loss, and competition from invasive species, has diminished wild populations, with parrots being subjected to more exploitation than any other group of birds. Measures taken to conserve the habitats of some high-profile charismatic species have also protected many of the less charismatic species living in the same ecosystems.
- 1 Taxonomy
- 2 Morphology
- 3 Distribution and habitat
- 4 Behaviour
- 5 Relationship with humans
- 6 See also
- 7 References
- 8 Further reading
- 9 External links
Origins and evolution
Psittaciform diversity in South America and Australasia suggests that the order may have evolved in Gondwana, centred in Australasia. The scarcity of parrots in the fossil record, however, presents difficulties in confirming the hypothesis, and there is currently a higher amount of fossil remains from the northern hemisphere in the early Cenozoic. Molecular studies suggest that parrots evolved approximately 59 million years ago (Mya) (range 66–51 Mya) in Gondwana. The three major clades of Neotropical parrots originated about 50 Mya (range 57–41 Mya).
A single 15 mm (0.6 in) fragment from a large lower bill (UCMP 143274), found in deposits from the Lance Creek Formation in Niobrara County, Wyoming, had been thought to be the oldest parrot fossil and is presumed to have originated from the Late Cretaceous period, which makes it about 70 million years old. However, other studies suggest that this fossil is not from a bird, but from a caenagnathid oviraptorosaur (a non-avian dinosaur with a birdlike beak), as several details of the fossil used to support its identity as a parrot are not actually exclusive to parrots, and it is dissimilar to the earliest-known unequivocal parrot fossils. Likewise, the earliest parrots do not have the specialised crushing bills of modern species.
It is now generally assumed that the Psittaciformes, or their common ancestors with several related bird orders, were present somewhere in the world around the Cretaceous–Paleogene extinction event (K-Pg extinction), some 66 Mya. If so, they probably had not evolved their morphological autapomorphies yet, but were generalised arboreal birds. The combined evidence supported the hypothesis of Psittaciformes being "near passerines", i.e. the mostly land-living birds that emerged in close proximity to the K-Pg extinction. Analysis of transposable element insertions observed in the genomes of passerines and parrots, but not in the genomes of other birds, provides strong evidence that parrots are the sister group of passerines, forming a clade Psittacopasserae, to the exclusion of the next closest group, the falcons.
Europe is the origin of the first undeniable parrot fossils, which date from about 50 Mya. The climate there and then was tropical, consistent with the Paleocene-Eocene thermal maximum. Initially, a neoavian named Mopsitta tanta, uncovered in Denmark's Early Eocene Fur Formation and dated to 54 Mya, was assigned to the Psittaciformes; it was described from a single humerus. However, the rather nondescript bone is not unequivocally psittaciform, and more recently it was pointed out that it may rather belong to a newly discovered ibis of the genus Rhynchaeites, whose fossil legs were found in the same deposits.
Fossils assignable to Psittaciformes (though not yet the present-day parrots) date from slightly later in the Eocene, starting around 50 Mya. Several fairly complete skeletons of parrot-like birds have been found in England and Germany. Some uncertainty remains, but on the whole it seems more likely that these are not direct ancestors of the modern parrots, but related lineages that evolved in the Northern Hemisphere and have since died out. These are probably not "missing links" between ancestral and modern parrots, but rather psittaciform lineages that evolved parallel to true parrots and cockatoos and had their own peculiar autapomorphies:
The earliest records of modern parrots date to about 23–20 Mya. The fossil record—mainly from Europe—consists of bones clearly recognisable as belonging to parrots of modern type. The Southern Hemisphere does not have nearly as rich a fossil record for the period of interest as the Northern, and contains no known parrot-like remains earlier than the early to middle Miocene, around 20 Mya. At this point, however, is found the first unambiguous parrot fossil (as opposed to a parrot-like one), an upper jaw that is indistinguishable from that of modern cockatoos.
|Phylogenetic relationship between the three parrot superfamilies |
The Psittaciformes comprise three main lineages: Strigopoidea, Psittacoidea and Cacatuoidea. The Strigopoidea were considered part of the Psittacoidea, but recent studies place this group of New Zealand species at the base of the parrot tree next to the remaining members of the Psittacoidea, as well as all members of the Cacatuoidea. The Cacatuoidea are quite distinct, having a movable head crest, a different arrangement of the carotid arteries, a gall bladder, differences in the skull bones, and lack the Dyck texture feathers that—in the Psittacidae—scatter light to produce the vibrant colours of so many parrots. Colourful feathers with high levels of psittacofulvin resist the feather-degrading bacterium Bacillus licheniformis better than white ones. Lorikeets were previously regarded as a third family, Loriidae,:45 but are now considered a tribe (Loriini) within the subfamily Lorinae, family Cacatuoidea. The two other tribes in the subfamily are the closely related fig parrots (two genera in the tribe Cyclopsittini) and budgerigar (tribe Melopsittacini).
|Phylogenetic relations between parrots |
Superfamily Strigopoidea: New Zealand parrots
- Family Nestoridae: two genera with two living (kea and New Zealand kaka) and several extinct species of the New Zealand region
- Family Strigopidae: the flightless, critically endangered kakapo of New Zealand
Superfamily Cacatuoidea: cockatoos
- Family Cacatuidae
Superfamily Psittacoidea: true parrots
- Family Psittacidae
- Family Psittaculidae
- Subfamily Psittrichasinae: one species, Pesquet's parrot
- Subfamily Coracopsinae: one genus with several species.
- Subfamily Platycercinae
- Subfamily Psittacellinae: one genus (Psittacella) with several species
- Subfamily Loriinae
- Subfamily Agapornithinae: three genera
- Subfamily Psittaculinae
Extant species range in size from the buff-faced pygmy parrot, at under 10 g (0.4 oz) in weight and 8 cm (3.1 in) in length,:149 to the hyacinth macaw, at 1 m (3.3 ft) in length, and the kakapo, at 4.0 kg (8.8 lb) in weight. Among the superfamilies, the three extant Strigopoidea species are all large parrots, and the cockatoos tend to be large birds, as well. The Psittacoidea parrots are far more variable, ranging the full spectrum of sizes shown by the family.
The most obvious physical characteristic is the strong, curved, broad bill. The upper mandible is prominent, curves downward, and comes to a point. It is not fused to the skull, which allows it to move independently, and contributes to the tremendous biting pressure the birds are able to exert. A large macaw, for example, has a bite force of 35 kg/cm2 (500 lb/sq in), close to that of a large dog. The lower mandible is shorter, with a sharp, upward-facing cutting edge, which moves against the flat portion of the upper mandible in an anvil-like fashion. Touch receptors occur along the inner edges of the kerantinised bill, which are collectively known as the "bill tip organ", allowing for highly dexterous manipulations. Seed-eating parrots have a strong tongue (containing similar touch receptors to those in the bill tip organ), which helps to manipulate seeds or position nuts in the bill so that the mandibles can apply an appropriate cracking force. The head is large, with eyes positioned high and laterally in the skull, so the visual field of parrots is unlike any other birds. Without turning its head, a parrot can see from just below its bill tip, all above its head, and quite far behind its head. Parrots also have quite a wide frontal binocular field for a bird, although this is nowhere near as large as primate binocular visual fields.
Parrots have strong zygodactyl feet with sharp, elongated claws, which are used for climbing and swinging. Most species are capable of using their feet to manipulate food and other objects with a high degree of dexterity, in a similar manner to a human using their hands. A study conducted with Australian parrots has demonstrated that they exhibit "handedness", a distinct preference with regards to the foot used to pick up food, with adult parrots being almost exclusively "left-footed" or "right-footed", and with the prevalence of each preference within the population varying by species.
Cockatoo species have a mobile crest of feathers on the top of their heads, which they can raise for display, and retract. No other parrots can do so, but the Pacific lorikeets in the genera Vini and Phigys can ruffle the feathers of the crown and nape, and the red-fan parrot (or hawk-headed parrot) has a prominent feather neck frill that it can raise and lower at will. The predominant colour of plumage in parrots is green, though most species have some red or another colour in small quantities. Cockatoos are the main exception to this, having lost the green and blue plumage colours in their evolutionary history; they are now predominately black or white with some red, pink, or yellow. Strong sexual dimorphism in plumage is not typical among parrots, with some notable exceptions, the most striking being the eclectus parrot.:202–207 However it has been shown that some parrot species exhibit sexually dimorphic plumage in the ultraviolet spectrum, normally invisible to humans.
Distribution and habitat
Parrots are found on all tropical and subtropical continents and regions including Australia and Oceania, South Asia, Southeast Asia, Central America, South America, and Africa. Some Caribbean and Pacific islands are home to endemic species. By far the greatest number of parrot species come from Australasia and South America. The lories and lorikeets range from Sulawesi and the Philippines in the north to Australia and across the Pacific as far as French Polynesia, with the greatest diversity being found in and around New Guinea. The subfamily Arinae encompasses all the neotropical parrots, including the amazons, macaws, and conures, and ranges from northern Mexico and the Bahamas to Tierra del Fuego in the southern tip of South America. The pygmy parrots, tribe Micropsittini, form a small genus restricted to New Guinea and the Solomon Islands. The superfamily Strigopoidea contains three living species of aberrant parrots from New Zealand. The broad-tailed parrots, subfamily Platycercinae, are restricted to Australia, New Zealand, and the Pacific islands as far eastwards as Fiji. The true parrot superfamily, Psittacoidea, includes a range of species from Australia and New Guinea to South Asia and Africa. The centre of cockatoo biodiversity is Australia and New Guinea, although some species reach the Solomon Islands (and one formerly occurred in New Caledonia), Wallacea and the Philippines.
Several parrots inhabit the cool, temperate regions of South America and New Zealand. One, the Carolina parakeet, lived in temperate North America, but was hunted to extinction in the early 20th century. Many parrots have been introduced to areas with temperate climates, and have established stable populations in parts of the United States (including New York City), the United Kingdom, Belgium and Spain, as well as in Greece.
Few parrots are wholly sedentary or fully migratory. Most fall somewhere between the two extremes, making poorly understood regional movements, with some adopting an entirely nomadic lifestyle. Only three species are migratory – the orange-bellied, blue-winged and swift parrots.
Numerous challenges are found in studying wild parrots, as they are difficult to catch and once caught, they are difficult to mark. Most wild bird studies rely on banding or wing tagging, but parrots chew off such attachments. Parrots also tend to range widely, and consequently many gaps occur in knowledge of their behaviour. Some parrots have a strong, direct flight. Most species spend much of their time perched or climbing in tree canopies. They often use their bills for climbing by gripping or hooking on branches and other supports. On the ground, parrots often walk with a rolling gait.
The diet of parrots consists of seeds, fruit, nectar, pollen, buds, and sometimes arthropods and other animal prey. The most important of these for most true parrots and cockatoos are seeds; the evolution of the large and powerful bill can be explained primarily as an adaptation to opening and consuming seeds. All true parrots except the Pesquet's parrot employ the same method to obtain the seed from the husk; the seed is held between the mandibles and the lower mandible crushes the husk, whereupon the seed is rotated in the bill and the remaining husk is removed. A foot is sometimes used to help hold large seeds in place. Parrots are seed predators rather than seed dispersers, and in many cases where species are recorded as consuming fruit, they are only eating the fruit to get at the seed. As seeds often have poisons that protect them, parrots carefully remove seed coats and other chemically defended fruit parts prior to ingestion. Many species in the Americas, Africa, and Papua New Guinea consume clay, which releases minerals and absorbs toxic compounds from the gut.
The lories and lorikeets, hanging parrots, and swift parrot are primarily nectar and pollen consumers, and have tongues with brush tips to collect this source of food, as well as some specialised gut adaptations to accommodate this diet. Many other species also consume nectar when it becomes available.
In addition to feeding on seeds and flowers, some parrot species prey on animals, especially invertebrate larvae. Golden-winged parakeets prey on water snails, the kea of New Zealand hunts adult sheep (though uncommon), and the Antipodes parakeet, another New Zealand parrot, enters the burrows of nesting grey-backed storm petrels and kills the incubating adults. Some cockatoos and the kākā excavate branches and wood to obtain grubs; the bulk of the yellow-tailed black cockatoo's diet is made up of insects.
With few exceptions, parrots are monogamous breeders who nest in cavities and hold no territories other than their nesting sites. The pair bonds of the parrots and cockatoos are strong and a pair remains close during the nonbreeding season, even if they join larger flocks. As with many birds, pair bond formation is preceded by courtship displays; these are relatively simple in the case of cockatoos. In Psittacidae parrots' common breeding displays, usually undertaken by the male, include slow, deliberate steps known as a "parade" or "stately walk" and the "eye-blaze", where the pupil of the eye constricts to reveal the edge of the iris. Allopreening is used by the pair to help maintain the bond. Cooperative breeding, where birds other than the breeding pair help raise the young and is common in some bird families, is extremely rare in parrots, and has only unambiguously been demonstrated in the El Oro parakeet and the golden parakeet (which may also exhibit polygamous, or group breeding, behaviour with multiple females contributing to the clutch).
Only the monk parakeet and five species of lovebirds build nests in trees, and three Australian and New Zealand ground parrots nest on the ground. All other parrots and cockatoos nest in cavities, either tree hollows or cavities dug into cliffs, banks, or the ground. The use of holes in cliffs is more common in the Americas. Many species use termite nests, possibly to reduce the conspicuousness of the nesting site or to create a favourable microclimate. In most cases, both parents participate in the nest excavation. The length of the burrow varies with species, but is usually between 0.5 and 2 m (1.6 and 6.6 ft) in length. The nests of cockatoos are often lined with sticks, wood chips, and other plant material. In the larger species of parrots and cockatoos, the availability of nesting hollows may be limited, leading to intense competition for them both within the species and between species, as well as with other bird families. The intensity of this competition can limit breeding success in some cases. Hollows created artificially by arborists have proven successful in boosting breeding rates in these areas. Some species are colonial, with the burrowing parrot nesting in colonies up to 70,000 strong. Coloniality is not as common in parrots as might be expected, possibly because most species adopt old cavities rather than excavate their own.
The eggs of parrots are white. In most species, the female undertakes all the incubation, although incubation is shared in cockatoos, the blue lorikeet, and the vernal hanging parrot. The female remains in the nest for almost all of the incubation period and is fed both by the male and during short breaks. Incubation varies from 17 to 35 days, with larger species having longer incubation periods. The newly born young are altricial, either lacking feathers or with sparse white down. The young spend three weeks to four months in the nest, depending on species, and may receive parental care for several months thereafter.
As typical of K-selected species, the macaws and other larger parrot species have low reproductive rates. They require several years to reach maturity, produce one or very few young per year, and do not necessarily breed every year.:125
Intelligence and learning
Studies with captive birds have given insight into which birds are the most intelligent. While parrots are able to mimic human speech, studies with the African grey parrot have shown that some are able to associate words with their meanings and form simple sentences. Along with crows, ravens, and jays (family Corvidae), parrots are considered the most intelligent of birds. The brain-to body size ratio of psittacines and corvines is comparable to that of higher primates. One argument against the supposed intelligent capabilities of bird species is that birds have a relatively small cerebral cortex, which is the part of the brain considered the main area of intelligence in other animals. However, birds use a different part of the brain, the mediorostral HVC as the seat of their intelligence. These species tend to have the largest hyperstriata, and Harvey J. Karten, a neuroscientist at the University of California, San Diego, who studied bird physiology, has discovered that the lower part of the avian brain is functionally similar to that in humans. Not only have parrots demonstrated intelligence through scientific testing of their language-using ability, but also some species of parrots such as the kea are also highly skilled at using tools and solving puzzles.
Learning in early life is apparently important to all parrots, and much of that learning is social learning. Social interactions are often practised with siblings, and in several species, creches are formed with several broods, and these, too, are important for learning social skills. Foraging behaviour is generally learnt from parents, and can be a very protracted affair. Suprageneralists and specialists generally become independent of their parents much quicker than partly specialised species who may have to learn skills over long periods as various resources become seasonally available. Play forms a large part of learning in parrots; it can be solitary, and related to motor skills, or social. Species may engage in play fights or wild flights to practice predator evasion. An absence of stimuli can delay the development of young birds, as demonstrated by a group of vasa parrots kept in tiny cages with domesticated chickens from the age of 3 months; at 9 months, these birds still behaved in the same way as 3-month-olds, but had adopted some chicken behaviour. In a similar fashion, captive birds in zoo collections or pets can, if deprived of stimuli, develop stereotyped behaviours and harmful behaviours like self plucking. Aviculturists working with parrots have identified the need for environmental enrichment to keep parrots stimulated.
Sound imitation and speech
Many parrots can imitate human speech or other sounds. A study by Irene Pepperberg suggested a high learning ability in an African grey parrot named Alex. Alex was trained to use words to identify objects, describe them, count them, and even answer complex questions such as "How many red squares?" with over 80% accuracy. N'kisi, another African grey, has been shown to have a vocabulary around a thousand words, and has displayed an ability to invent, as well as use words in context and in the correct tense.
Parrots do not have vocal cords, so sound is accomplished by expelling air across the mouth of the bifurcated trachea, in the organ called the syrinx. Different sounds are produced by changing the depth and shape of the trachea. African grey parrots of all subspecies are known for their superior ability to imitate sounds and human speech. This ability has made them prized as pets from ancient times to the present. In the Masnavi, written by Rumi of Persia in 1250, the author describes an ancient method for training parrots to speak.
Although most parrot species are able to imitate, some of the amazon parrots are generally regarded as the next-best imitators and speakers of the parrot world. The question of why birds imitate remains open, but those that do often score very high on tests designed to measure problem-solving ability. Wild African grey parrots have been observed imitating other birds.
The journal Animal Cognition stated that some birds preferred to work alone, while others like to work together as with African grey parrots. With two parrots, they know the order of tasks or when they should do something together at once, but they have trouble exchanging roles. With three parrots, one parrot usually prefers to cooperate with one of the other two, but all of them are cooperating to solve the task.
Relationship with humans
Parrots may not make good pets for most people because of their natural wild instincts such as screaming and chewing. Although parrots can be very affectionate and cute when immature, they often become aggressive when mature (partly due to mishandling and poor training) and may bite, causing serious injury. For this reason, parrot rescue groups estimate that most parrots are surrendered and rehomed through at least five homes before reaching their permanent destinations or before dying prematurely from unintentional or intentional neglect and abuse. The parrots' ability to mimic human words and their bright colours and beauty prompt impulse buying from unsuspecting consumers. The domesticated budgerigar, a small parrot, is the most popular of all pet bird species. In 1992, the newspaper USA Today published that 11 million pet birds were in the United States alone, many of them parrots. Europeans kept birds matching the description of the rose-ringed parakeet (or called the ring-necked parrot), documented particularly in a first-century account by Pliny the Elder. As they have been prized for thousands of years for their beauty and ability to talk, they have also often been misunderstood. For example, author Wolfgang de Grahl says in his 1987 book The Grey Parrot that some importers had parrots drink only coffee while they were shipped by boat, believing that pure water was detrimental and that their actions would increase survival rates during shipping. Nowadays, it is commonly accepted that the caffeine in coffee is toxic to birds.
Pet parrots may be kept in a cage or aviary; though generally, tame parrots should be allowed out regularly on a stand or gym. Depending on locality, parrots may be either wild-caught or be captive-bred, though in most areas without native parrots, pet parrots are captive-bred. Parrot species that are commonly kept as pets include conures, macaws, amazon parrots, cockatoos, African greys, lovebirds, cockatiels, budgerigars, caiques, parakeets, and Eclectus, Pionus, and Poicephalus species. Temperaments and personalities vary even within a species, just as with dog breeds. African grey parrots are thought to be excellent talkers, but not all African grey parrots want to talk, though they have the capability to do so. Noise level, talking ability, cuddliness with people, and care needs can sometimes depend on how the bird is cared for and the attention he/she regularly receives.
Parrots invariably require an enormous amount of attention, care, and intellectual stimulation to thrive, akin to that required by a three-year-old child, which many people find themselves unable to provide in the long term. Parrots that are bred for pets may be hand fed or otherwise accustomed to interacting with people from a young age to help ensure they become tame and trusting. However, even when hand fed, parrots revert to biting and aggression during hormonal surges and if mishandled or neglected. Parrots are not low-maintenance pets; they require feeding, grooming, veterinary care, training, environmental enrichment through the provision of toys, exercise, and social interaction (with other parrots or humans) for good health.
Some large parrot species, including large cockatoos, amazons, and macaws, have very long lifespans, with 80 years being reported, and record ages of over 100. Small parrots, such as lovebirds, hanging parrots, and budgies, have shorter lifespans up to 15–20 years. Some parrot species can be quite loud, and many of the larger parrots can be destructive and require a very large cage, and a regular supply of new toys, branches, or other items to chew up. The intelligence of parrots means they are quick to learn tricks and other behaviours—both good and bad—that get them what they want, such as attention or treats.
The popularity, longevity, and intelligence of many of the larger kinds of pet parrots and their wild traits such as screaming, has led to many birds needing to be rehomed during the course of their long lifespans. A common problem is that large parrots that are cuddly and gentle as juveniles mature into intelligent, complex, often demanding adults who can outlive their owners, and can also become aggressive or even dangerous. Due to an increasing number of homeless parrots, they are being euthanised like dogs and cats, and parrot adoption centres and sanctuaries are becoming more common.:77–78 Parrots do not often do well in captivity, causing some parrots to go insane and develop repetitive behaviours, such as swaying and screaming, or they become riddled with intense fear. Feather destruction and self-mutilation, although not commonly seen in the wild, occur frequently in captivity.
The popularity of parrots as pets has led to a thriving—and often illegal—trade in the birds, and some species are now threatened with extinction. A combination of trapping of wild birds and damage to parrot habitats makes survival difficult or even impossible for some species of parrot. Importation of wild-caught parrots into the US and Europe is illegal after the Wild Bird Population Act was passed in 1992.
The trade continues unabated in some countries. A report published in January 2007 presents a clear picture of the wild-caught parrot trade in Mexico, stating: "The majority of parrots captured in Mexico stay in the country for the domestic trade. A small percentage of this capture, 4% to 14%, is smuggled into the USA."
The scale of the problem can be seen in the Tony Silva case of 1996, in which a parrot expert and former director at Tenerife's Loro Parque (Europe's largest parrot park) was jailed in the United States for 82 months and fined $100,000 for smuggling hyacinth macaws (Such birds command a very high price.) The case led to calls for greater protection and control over trade in the birds. Different nations have different methods of handling internal and international trade. Australia has banned the export of its native birds since 1960. Following years of campaigning by hundreds of NGOs and outbreaks of avian flu, in July 2007, the European Union halted the importation of all wild birds with a permanent ban on their import. Prior to an earlier temporary ban started in late October 2005, the European Union (EU) was importing about two million live birds a year, about 90% of the international market: hundreds of thousands of these were parrots. No national laws protect feral parrot populations in the U.S. Mexico has a licensing system for capturing and selling native birds.
Parrots have featured in human writings, story, art, humor, religion, and music for thousands of years. From Aesop's fable "The parrot and the cat" and the Roman poet Ovid's "The Dead Parrot" to Monty Python's "Dead Parrot sketch", parrots have existed in the consciousness of many cultures. Recent books about parrots in human culture include Parrot Culture.
In ancient times and current, parrot feathers have been used in ceremonies and for decoration. They also have a long history as pets, stretching back thousands of years, and were often kept as a symbol of royalty or wealth. In Polynesian legend as current in the Marquesas Islands, the hero Laka/Aka is mentioned as having undertaken a long and dangerous voyage to Aotona in what are now the Cook Islands, to obtain the highly prized feathers of a red parrot as gifts for his son and daughter. On the voyage, 100 of his 140 rowers died of hunger on their way, but the survivors reached Aotona and captured enough parrots to fill 140 bags with their feathers. Parrots have also been considered sacred. The Moche people of ancient Peru worshipped birds and often depicted parrots in their art. Parrots are popular in Buddhist scripture and many writings about them exist. For example, Amitābha once changed himself into a parrot to aid in converting people. Another old story tells how after a forest caught fire, the parrot was so concerned, it carried water to try to put out the flames. The ruler of heaven was so moved upon seeing the parrot's act, he sent rain to put out the fire. In Chinese Buddhist iconography, a parrot is sometimes depicted hovering on the upper right side Guan Yin clasping a pearl or prayer beads in its beak.
Parrots are used as symbols of nations and nationalism. A parrot is found on the flag of Dominica and two parrots on their coat of arms. The St. Vincent parrot is the national bird of St. Vincent and the Grenadines, a Caribbean nation.
Sayings about parrots colour the modern English language. The verb "parrot" in the dictionary means "to repeat by rote". Also clichés such as the British expression "sick as a parrot" are given; although this refers to extreme disappointment rather than illness, it may originate from the disease of psittacosis, which can be passed to humans. The first occurrence of a related expression is in Aphra Behn's 1681 play The False Count. Fans of Jimmy Buffett are known as parrotheads. Parrots feature in many media. Magazines are devoted to parrots as pets, and to the conservation of parrots. Fictional films include Home Alone 3  and Rio, and documentaries include The Wild Parrots of Telegraph Hill.
Escaped parrots of several species have become established in the wild outside their natural ranges and in some cases outside the natural range of parrots. Among the earliest instances were pet red shining-parrots from Fiji, which established a population on the islands of southern Tonga. These introductions were prehistoric and red-shining parrots were recorded in Tonga by Captain Cook in the 1770s. Escapees first began breeding in cities in California, Texas, and Florida in the 1950s (with unproven earlier claims dating back to the 1920s in Texas and Florida). They have proved surprisingly hardy in adapting to conditions in Europe and North America. They sometimes even multiply to the point of becoming a nuisance or pest, and a threat to local ecosystems, and control measures have been used on some feral populations.
Feral parrot flocks can be formed after mass escapes of newly imported, wild-caught parrots from airports or quarantine facilities. Large groups of escapees have the protection of a flock and possess the skills to survive and breed in the wild. Some feral parakeets may have descended from escaped zoo birds. Escaped or released pets rarely contribute to establishing feral populations. Escapes typically involve only one or a few birds at a time, so the birds do not have the protection of a flock and often do not have a mate. Most captive-born birds do not possess the necessary survival skills to find food or avoid predators and often do not survive long without human caretakers. However, in areas where there are existing feral parrot populations, escaped pets may sometimes successfully join these flocks. The most common era or years that feral parrots were released to non-native environments was from the 1890s to the 1940s, during the wild-caught parrot era. In the psittacosis "parrot fever" panic of 1930, a city health commissioner urged everyone who owned a parrot to put them down, but owners abandoned their parrots on the streets.
Threats and conservation
Many parrot species are in decline and several are extinct. Of the 350 or so living species, 130 are listed as near threatened or worse by the International Union for Conservation of Nature (IUCN), and 16 of which are currently considered critically endangered. Several reasons are given for the decline of so many species, the principal threats being habitat loss and degradation, hunting, and for certain species, the wild-bird trade. Parrots are persecuted because, in some areas, they are (or have been) hunted for food and feathers, and as agricultural pests. For a time, Argentina offered a bounty on Monk parakeets (an agricultural pest), resulting in hundreds of thousands of birds being killed, though apparently this did not greatly affect the overall population.
Capture for the pet trade is a threat to many of the rarer or slower-to-breed parrots. Habitat loss or degradation, most often for agriculture, is a threat to many species. Parrots, being cavity nesters, are vulnerable to the loss of nesting sites and to competition with introduced species for those sites. The loss of old trees is a particular problem in some areas, particularly in Australia, where suitable nesting trees must be centuries old. Many parrots occur only on islands and are vulnerable to introduced species such as rats and cats, as they lack the appropriate antipredator behaviours needed to deal with mammalian predators. Controlling such predators can help in maintaining or increasing the numbers of endangered species. Insular species, such as the Puerto Rican amazon, which have small populations in restricted habitats, are also vulnerable to (unpredictable) natural events such as hurricanes.
Many active conservation groups have as their goal the conservation of wild parrot populations. One of the largest is the World Parrot Trust, an international organisation. The group gives assistance to worthwhile projects, as well as producing a magazine (PsittaScene) and raising funds through donations and memberships, often from pet parrot owners. They state they have helped conservation work in 22 countries. On a smaller scale, local parrot clubs raise money to donate to a conservation cause. Zoo and wildlife centres usually provide public education, to change habits that cause damage to wild populations. Recent conservation measures to conserve the habitats of some of the high-profile charismatic parrot species has also protected many of the less charismatic species living in the ecosystem.:12 A popular attraction that many zoos employ is a feeding station for lories and lorikeets, where visitors feed small parrots with cups of liquid food. This is usually done in association with educational signs and lectures. Birdwatching-based ecotourism can be beneficial to economies.
Several projects aimed specifically at parrot conservation have met with success. Translocation of vulnerable kakapo, followed by intensive management and supplementary feeding, has increased the population from 50 individuals to 123. In New Caledonia, the Ouvea parakeet was threatened by trapping for the pet trade and loss of habitat. Community-based conservation, which eliminated the threat of poaching, has allowed the population to increase from around 600 birds in 1993 to over 2000 birds in 2009.
As of 2009, the IUCN recognises 19 species of parrot as extinct since 1600 (the date used to denote modern extinctions). This does not include species like the New Caledonian lorikeet, which has not been officially seen for 100 years, yet is still listed as critically endangered.
Trade, export, and import of all wild-caught parrots is regulated and only permitted under special licensed circumstances in countries party to the Convention on the International Trade in Endangered Species, that came into force in 1975 to regulate the international trade of all endangered wild-caught animal and plant species. In 1975, 24 parrot species were included on Appendix I of CITES, thus prohibiting commercial international trade in these birds. Since that initial listing, continuing threats from international trade led CITES to add an additional 32 parrot varieties to Appendix I. All the other parrot species are protected on Appendix II of CITES. In addition, individual countries may have laws to regulate trade in certain species; for example, the EU has banned parrot trade, whereas Mexico has a licensing system for capturing parrots.
- Waterhouse, David M. (2006). "Parrots in a nutshell: The fossil record of Psittaciformes (Aves)". Historical Biology. 18 (2): 223–234. doi:10.1080/08912960600641224.
- "Psittacine". American Heritage Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company. 2000. Archived from the original on 2007-08-27. Retrieved 2007-09-09.
- "Psittacine". Merriam-Webster Online Dictionary. Merriam-Webster, Inc. Retrieved 2007-09-09.
- Wright, T.F.; Schirtzinger E. E.; Matsumoto T.; Eberhard J. R.; Graves G. R.; Sanchez J. J.; Capelli S.; Muller H.; Scharpegge J.; Chambers G. K.; Fleischer R. C. (2008). "A Multilocus Molecular Phylogeny of the Parrots (Psittaciformes): Support for a Gondwanan Origin during the Cretaceous". Molecular Biology and Evolution. 25 (10): 2141–2156. doi:10.1093/molbev/msn160. PMC . PMID 18653733.
- Mayr, G. (2009). Paleogene fossil birds. Springer.
- Tavares ES, Baker AJ, Pereira SL, Miyaki CY (2006). "Phylogenetic relationships and historical biogeography of neotropical parrots (Psittaciformes: Psittacidae: Arini) inferred from mitochondrial and nuclear DNA sequences". Systemic Biology. 55 (3): 454–470. doi:10.1080/10635150600697390. PMID 16861209.
- Stidham, T. (1998). "A lower jaw from a Cretaceous parrot". Nature. 396 (6706): 29–30. Bibcode:1998Natur.396...29S. doi:10.1038/23841.
- Dyke, GJ; Mayr, G. (1999). "Did parrots exist in the Cretaceous period?". Nature. 399 (6734): 317–318. Bibcode:1999Natur.399..317D. doi:10.1038/20583.
- Waterhouse DM (2006). "Parrots in a nutshell: The fossil record of Psittaciformes (Aves)". Historical Biology. 18 (2): 227–238. doi:10.1080/08912960600641224.
- Ksepka, Daniel T.; Clarke, Julia A.; Grande, Lance (2011). "Stem Parrots (Aves, Halcyornithidae) from the Green River Formation and a Combined Phylogeny of Pan-Psittaciformes". Journal of Paleontology. 85 (5): 835–852. doi:10.1666/10-108.1. ISSN 1937-2337.
- Suh A, Paus M, Kiefmann M; Paus; Kiefmann; Churakov; Franke; Brosius; Kriegs; Schmitz (2011). "Mesozoic retroposons reveal parrots as the closest living relatives of passerine birds". Nature Communications. 2 (8): 443–8. Bibcode:2011NatCo...2E.443S. doi:10.1038/ncomms1448. PMC . PMID 21863010.
- Waterhouse, D.M.; Lindow, B.E.K.; Zelenkov, N.; Dyke, G.J. (2008). "Two new fossil parrots (Psittaciformes) from the Lower Eocene Fur Formation of Denmark". Palaeontology. 51 (3): 575–582. doi:10.1111/j.1475-4983.2008.00777.x.
- Dyke, GJ; Cooper, JH (2000). "A new psittaciform bird from the London clay (Lower Eocene) of England". Palaeontology. 43 (2): 271–285. doi:10.1111/1475-4983.00126.
- Ksepka, Daniel T.; Clarke, Julia A.; Grande, Lance (2011). "Stem Parrots (Aves, Halcyornithidae) from the Green River Formation and a Combined Phylogeny of Pan-Psittaciformes". Journal of Paleontology. 85 (5): 835–852. doi:10.1666/10-108.1. ISSN 1937-2337.
- Gerald Mayr, Well-preserved new skeleton of the Middle Eocene Messelastur substantiates sister group relationship between Messelasturidae and Halcyornithidae (Aves, ?Pan-Psittaciformes), Pages 159-171 | Received 05 Apr 2010, Accepted 28 Jun 2010, Published online: 26 Dec 2010 Download citation http://dx.doi.org/10.1080/14772019.2010.505252
- Cameron 2007, p. 43.
- Toft, Catherine A.; Wright, Timothy F. (2015). Parrots of the Wild: A Natural History of the World's Most Captivating Birds. Oakland, California: University of California Press. p. 14. ISBN 978-0-520-23925-8.
- de Kloet, RS; de Kloet SR (2005). "The evolution of the spindlin gene in birds: Sequence analysis of an intron of the spindlin W and Z gene reveals four major divisions of the Psittaciformes". Molecular Phylogenetics and Evolution. 36 (3): 706–721. doi:10.1016/j.ympev.2005.03.013. PMID 16099384.
- Tokita, M; Kiyoshi T; Armstrong KN (2007). "Evolution of craniofacial novelty in parrots through developmental modularity and heterochrony". Evolution and Development. 9 (6): 590–601. doi:10.1111/j.1525-142X.2007.00199.x. PMID 17976055.
- Joseph, Leo; et al. (2012). "A revised nomenclature and classification for family-group taxa of parrots (Psittaciformes)" (PDF). Zootaxa. 3205: 26–40.
- Burtt, E. H.; Schroeder, M. R.; Smith, L. A.; Sroka, J. E.; McGraw, K. J. (2010). "Colourful parrot feathers resist bacterial degradation". Biology Letters. 7 (2): 214–216. doi:10.1098/rsbl.2010.0716. PMC . PMID 20926430.
- Forshaw, Joseph M.; Cooper, William T. (1978) . Parrots of the World (2nd ed.). Melbourne, Australia: Landsdowne Editions. ISBN 978-0-7018-0690-3.
- "Zoological Nomenclature Resource: Psittaciformes (Version 9.013)". zoonomen.net. 29 December 2008.
- White, Nicole E.; et al. (2011). "The evolutionary history of cockatoos (Aves: Psittaciformes: Cacatuidae)". Molecular Phylogenetics and Evolution. 59 (3): 615–622. doi:10.1016/j.ympev.2011.03.011. PMID 21419232.
- Schweizer, Manuel; Seehausen, Ole & Hertwig, Stefan T. (2011). "Macroevolutionary patterns in the diversification of parrots: effects of climate change, geological events and key innovations". Journal of Biogeography. 38 (11): 2176–2194. doi:10.1111/j.1365-2699.2011.02555.x.
- Joseph, Leo; Toon, Alicia; Schirtzinger, Erin E. & Wright, Timothy F. (2011). "Molecular systematics of two enigmatic genera Psittacella and Pezoporus illuminate the ecological radiation of Australo-Papuan parrots (Aves: Psittaciformes)". Molecular Phylogenetics and Evolution. 59 (3): 675–684. doi:10.1016/j.ympev.2011.03.017. PMID 21453777.
- Schweizer, M.; Seehausen O; Güntert M; Hertwig ST (2009). "The evolutionary diversification of parrots supports a taxon pulse model with multiple trans-oceanic dispersal events and local radiations". Molecular Phylogenetics and Evolution. 54 (3): 984–94. doi:10.1016/j.ympev.2009.08.021. PMID 19699808.
- Forshaw, Joseph M. (2006). Parrots of the World; an Identification Guide. Princeton University Press. p. 70. ISBN 978-0-691-09251-5.
- Dunning, Jr., John B., ed. (2008). CRC Handbook of Avian Body Masses (2 ed.). CRC Press. ISBN 978-1-4200-6444-5.
- Sweat, Rebecca. "Powerful Bird Beaks". Retrieved 8 August 2016.
- Demery, Zoe P.; Chappell, J.; Martin, G. R. (2011). "Vision, touch and object manipulation in Senegal parrots Poicephalus senegalus". Proceedings of the Royal Society B. 278 (1725): 3687–3693. doi:10.1098/rspb.2011.0374. PMC . PMID 21525059.
- Brennand, Emma (2011-02-02). "Parrots prefer 'left handedness'". BBC Earth News. Retrieved 5 February 2011.
- Cameron 2007, p. 57.
- Cameron 2007, p. 1.
- Santos, Susana I. C O.; Elward, Brian; Lumeij, Johannes T. (1 March 2006). "Sexual Dichromatism in the Blue-fronted Amazon Parrot (Amazona aestiva) Revealed by Multiple-angle Spectrometry". Journal of Avian Medicine and Surgery. 20 (1): 8–14. doi:10.1647/1082-6742(2006)20[8:SDITBA]2.0.CO;2.
- Masello, J. F. , Lubjuhn, T. , Quillfeldt, P. (2009). "Hidden dichromatism in the Burrowing Parrot (Cyanoliseus patagonus) as revealed by spectrometric colour analysis". Hornero. 024 (1): 047–055. ISSN 1850-4884.
- Cooke, Fred; Bruce, Jenni (2004). The Encyclopedia of Animals: a complete visual guide (1 ed.). Berkeley, California: University of California Press. p. 296. ISBN 978-0-520-24406-1.
- Bradford, Alina (2014). "Parrot Facts: Habits, Habitats and Species". LiveScience. Retrieved 7 August 2016.
- Forshaw, Joseph M. (1989). Parrots of the World (3 ed.). London: Blandford Press. ISBN 978-0-7137-2134-8.
- "Pygmy parrots". BBC Nature. 2014. Retrieved 7 August 2016.
- Bonaparte, C. L. (1850). Conspectus Generum Avium (in Latin). Lugduni Batavorum.
- Heads, Michael (2012). Molecular Panbiogeography of the Tropics. 4. Berkeley, California: University of California Press. p. 296. ISBN 978-0-520-27196-8.
- Steadman, D. (2006). Extinction and Biogeography in Tropical Pacific Birds. University of Chicago Press. pp. 342–351. ISBN 978-0-226-77142-7.
- Cameron 2007, p. 86.
- Steve Baldwin. "about the Wild Parrots of Brooklyn". BrooklynParrots.com. Retrieved 2013-02-27.
- Coughlan, Sean (2004-07-06). "Wild parrots settle in suburbs". BBC News.
- "The Brussels Connection". Thebrusselsconnection.be. Retrieved 2013-02-27.
- Butler, C (2005). "Feral Parrots in the Continental United States and United Kingdom: Past, Present, and Future". Journal of Avian Medicine and Surgery. 19 (2): 142–149. doi:10.1647/183.
- Sol, Daniel; Santos, David M.; Feria, Elías; Clavell, Jordi (1997). "Habitat Selection by the Monk Parakeet during Colonization of a New Area in Spain". Condor. 99 (1): 39–46. doi:10.2307/1370222. JSTOR 1370222.
- Kalodimos, Nicholas P. (2013). "First Account of a Nesting Population of Monk Parakeets, Myiopsitta monachus With Nodule-shaped Bill Lesions in Katehaki, Athens, Greece" (PDF). Bird Populations. 12 (1–6).
- Collar, N. (1997). "Family Psittacidae (Parrots)". In del Hoyo, J.; Elliott, A.; Sargatal, J. Handbook of the Birds of the World. Sandgrouse to Cuckoos. Barcelona: Lynx Editions. ISBN 978-84-87334-22-1.
- Juniper, Tony; Mike Parr (2010). Parrots: A Guide to Parrots of the World. A & C Black. p. 21. ISBN 978-1-4081-3575-4.
- Diamond, J (1999). "Evolutionary biology: Dirty eating for healthy living". Nature. 400 (6740): 120–121. Bibcode:1999Natur.400..120D. doi:10.1038/22014. PMID 10408435.
- Gartrell, B; Jones, S; Brereton, R; Astheimer, L (2000). "Morphological Adaptations to Nectarivory of the Alimentary Tract of the Swift Parrot Lathamus discolor". Emu. 100 (4): 274–279. doi:10.1071/MU9916.
- Schweizer,, Manuel; Güntert, Marcel; Seehausen, Ole; Leuenberger, Christoph; Hertwig, Stefan T. (2014). "Parallel adaptations to nectarivory in parrots, key innovations and the diversification of the Loriinae". Ecology and Evolution. 4 (14): 2867–2883. doi:10.1002/ece3.1131. PMC . PMID 25165525.
- "Golden-winged Parakeet (Brotogeris chrysoptera)". World Parrot Trust. Retrieved 8 August 2016.
- Jackson, J. R. (1962). "Do Keas Attack Sheep?" (PDF). Notornis. 10 (1).
- Greene, Terry (November–December 1999). "Aspects of the ecology of Antipodes Parakeet (Cyanoramphus unicolor) and Reischek's Parakeet (C. novaezelandiae hochstetten) on Antipodes Island" (PDF). Notornis. Ornithological Society of New Zealand. 46 (2): 301–310.
- Cameron 2007, p. 114–116.
- Rowley, I. (1997). "Family Cacatuidae (Cockatoos)". In del Hoyo, J.; Elliott, A.; Sargatal, J. Handbook of the Birds of the World. 4. Barcelona: Lynx Editions. ISBN 978-84-87334-22-1.
- Oren, David C.; Novaes, Fernando (1986). "Observations on the golden parakeet Aratinga guarouba in Northern Brazil". Biological Conservation. 36 (4): 329–337. doi:10.1016/0006-3207(86)90008-X.
- Eberhard, J (1998). "Evolution of nest-building behavior in Agapornis parrots" (PDF). Auk. 115 (2): 455–464. doi:10.2307/4089204. JSTOR 4089204.
- Sanchez-Martinez, Tania; Katherine Renton (2009). "Availability and selection of arboreal termitaria as nest-sites by Orange-fronted Parakeets Aratinga canicularis in conserved and modified landscapes in Mexico". Ibis. 151 (2): 311–320. doi:10.1111/j.1474-919X.2009.00911.x.
- Heinsohn, Robert; Murphy, Stephen; Legge, Sarah (2003). "Overlap and competition for nest holes among eclectus parrots, palm cockatoos and sulphur-crested cockatoos". Australian Journal of Zoology. 51 (1): 81–94. doi:10.1071/ZO02003.
- Pell, A; Tidemann, C (1997). "The impact of two exotic hollow-nesting birds on two native parrots in savannah and woodland in eastern Australia". Biological Conservation. 79 (2): 145–153. doi:10.1016/S0006-3207(96)00112-7.
- "Man-made nesting hollows big hit with endangered swift parrots". 21 October 2016.
- Masello, J; Pagnossin, M; Sommer, C; Quillfeldt, P (2006). "Population size, provisioning frequency, flock size and foraging range at the largest known colony of Psittaciformes: the Burrowing Parrots of the north-eastern Patagonian coastal cliffs". Emu. 106 (1): 69–79. doi:10.1071/MU04047.
- Eberhard, Jessica (2002). "Cavity adoption and the evolution of coloniality in cavity-nesting birds". Condor. 104 (2): 240–247. doi:10.1650/0010-5422(2002)104[0240:CAATEO]2.0.CO;2. ISSN 0010-5422.
- Forshaw, Joseph (1991). Forshaw, Joseph, ed. Encyclopaedia of Animals: Birds. London: Merehurst Press. pp. 118–124. ISBN 978-1-85391-186-6.
- Tweti, Mira (2008). Of Parrots and People (1 ed.). New York: Viking Penguin. ISBN 978-0-14-311575-5.
- Iwaniuk, Andrew (2004-02-09). "This Bird Is No Airhead". Natural Sciences and Engineering Research Council of Canada. Archived from the original on 2008-02-22. Retrieved 2007-09-09.
- Emery, Nathan J. (2006). "Cognitive ornithology: the evolution of avian intelligence". Philosophical Transacations of the Royal Society B: Biological Sciences. 361 (1465): 23–43. doi:10.1098/rstb.2005.1736. PMC . PMID 16553307.
- Beynon, Mike (April 2000). "Who's a clever bird, then?". BBC News. Archived from the original on 2007-09-01. Retrieved 2007-09-09.
- Cussen, Victoria A.; Mench, Joy A. (2015). Wicker-Thomas, Claude, ed. "The Relationship between Personality Dimensions and Resiliency to Environmental Stress in Orange-Winged Amazon Parrots (Amazona amazonica), as Indicated by the Development of Abnormal Behaviors". PLoS ONE. 10 (6): e0126170. doi:10.1371/journal.pone.0126170. PMC . PMID 26114423.
- Pepperberg, Irene M. (1988). "Comprehension of "Absence" by an African Grey Parrot: Learning with Respect to Questions of Same/Different" (PDF). Journal of Experimental Analysis of Behaviour. 50 (3): 553–564. doi:10.1901/jeab.1988.50-553. PMC . PMID 16812572.
- Dunayer, Joan (2013). Corbey, Raymond; Lanjouw, Annette, eds. The Politics of Species: Reshaping our Relationships with Other Animals. New York: Cambridge University Press. p. 33. ISBN 978-1-107-03260-6.
- Patterson, Dianne K.; Pepperberg, Irene M.; Story, Brad H.; Hoffman, Eric A. (1997). "How parrots talk: Insights based on CT scans, image processing and mathematical models". Proceedings of the International Society for Optical Engineering. Medical Imaging 1997: Physiology and Function from Multidimensional Images. 3033: 14. doi:10.1117/12.274039.
- BirdLife International (2013). "Psittacus erithacus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 9 August 2016.
- Gamard, Ibrahim. "The Merchant and the Parrot". Dar-Al Masnavi. Retrieved 9 August 2016.
- Cruickshank, A; Gautier, J; Chappuis, C (1993). "Vocal mimicry in wild African Grey Parrots Psittacus erithacus". Ibis. 135 (3): 293–299. doi:10.1111/j.1474-919X.1993.tb02846.x.
- Péron, F.; Rat-Fischer, L.; Lalot, M.; Nagle, L.; Bovet, D. (2011). "Cooperative problem solving in African grey parrots (Psittacus erithacus)". Animal Cognition. 14 (4): 545–553. doi:10.1007/s10071-011-0389-2. PMID 21384141.
- Gill, Victoria (18 May 2011). "Parrots choose to work together". BBC Nature. Retrieved 3 July 2016.
- "Choosing a New Pet Bird". Petco. Retrieved 1 August 2016.
- Grindol, Diane (2013). "Budgie Vs. Cockatiel — Which Right For You?". Retrieved 1 August 2016.
- Ward, Sam (1992-12-21). "USA Snapshots: Most Popular Pets". USA Today. Retrieved 6 September 2009.
- "Parrot". The Medieval Bestiary. 2011. Retrieved 1 August 2016.
- de Grahl, Wolfgang (1989). The Grey Parrot. Tfh Publications Incorporated. ISBN 978-0-86622-094-1.
- Sweat, Rebecca (March 2015). "Foods such as alcohol, chocolate, avocado, uncooked meats and shellfish can be bad for your pet bird". BirdChannel.com. Retrieved 12 July 2016.
- "Pet Birds, Parrots, Cockatiels, Macaws, Conures, Parakeets Care". BirdChannel. Retrieved 1 August 2016.
- The National Parrot Sanctuary. "The National Parrot Sanctuary – Europe's Only Dedicated Parrot Zoo". parrotsanctuary.co.uk. Archived from the original on 2008-06-19.
- Noeth, Gay; Johnson, Sibylle. "Biting: The Sharp Beak". Avian Web: Beauty of Birds. Retrieved 1 August 2016.
- Patt, Jill M. "Bird Behavior and Training". Avian Web: Beauty of Birds. Retrieved 1 August 2016.
- Leisure, Susan. "How Long can a Parrot Live?". The nest. Retrieved 5 August 2016.
- "Winston's obscene parrot lives on". BBC News. 2004. Retrieved 5 August 2016.
- Coila, Bridget. "The Average Lifespan of Parrots". The nest. Retrieved 1 August 2016.
- "The Truth About Parrots as Pets". In Defense of Animals. Retrieved 1 August 2016.
- Kelly, Denise; Rae, Joan; Menzel, Krista (2007). "The True Nature of Parrots". Avian Welfare Coalition. Retrieved 1 August 2016.
- Clay, R.; Donegan, T.; Hennessey, A.; Herrera, M.; López de Kochalka, N.; Pryor, J.; Yamashita, C.; del Castillo, H. (2014). "Anodorhynchus hyacinthinus". IUCN Red List of Threatened Species. Version 2014.2. International Union for Conservation of Nature. Retrieved 3 July 2016.
- Munn, Charles A.; Thomsen, Jorgen B.; Yamashita, Carlos (2013). Chandler, William J.; Wille, Chris; Labate, Lillian, eds. Audubon Wildlife Report, 1988–1989. Academic Press. pp. 405–419. ISBN 978-0-12-041001-9.
- Vallery, Anna (January 2015). "The Truth About the Exotic Bird Trade Will Make You Rethink Buying a Parrot in the Pet Shop". One Green Planet. Retrieved 5 August 2016.
- "Stopping the Illegal Mexican Parrot Trade". Defenders of Wildlife. Archived from the original on 2008-03-02. Retrieved 23 December 2007.
- Lowther, Jason; Cook, Dee; Roberts, Martin (5 August 2002). Crime and Punishment in the Wildlife Trade (PDF). World Wildlife Federation. Retrieved 9 September 2007.
- Soucek, Gayle (2008). Gouldian Finches. Barron's Educational Series. p. 7. ISBN 978-0-7641-3850-8.
- "New rules for captive bird imports to protect animal health in the EU and improve the welfare of imported birds". European Commission: Press Release Database. 2015. Retrieved 6 August 2016.
- "EU Permanently Bans Import of Wild Birds". Defenders of Wildlife. January 2007. Retrieved 5 August 2016.
- "Naturalized Parrots in the U.S.". Avian Welfare Coalition. Retrieved 9 August 2016.
- Guzman, Juan C. C.; Sanchez, Saldana M. E.; Grosselet, Manuel; Gomez, Jesus S. (2007). The Illegal Parrot Trade in Mexico (Report). Mexico: Defenders of Wildlife. pp. 9–10.
- "The Cat and the Parrot". Fairy Tales and Other Traditional Stories. 2012. Retrieved 9 August 2016.
- "Full Frontal Nudity (The Dead Parrot sketch)". Monty Python. Season 1. United Kingdom. December 1969. 5:33 minutes in. BBC1.
- Boehrer, Bruce (2004). Parrot Culture. Philadelphia: University of Pennsylvania Press. ISBN 978-0-8122-3793-1.
- "Feathers have always been used by humans as decoration and status symbols". BirdLife International. 2008. Retrieved 9 August 2016.
- Chamberlain, Susan (2013). "Parrot History: Yesterday and Today". BirdChannel. Retrieved 9 August 2016.
- Craig, Robert D. (1989). Dictionary of Polynesian mythology. Greenwood Publishing Group. p. 6. ISBN 978-0-313-25890-9.
- Handy, E. S. C. (1930). Marquesan Legends. Honolulu: Bernice P. Bishop Museum Press. pp. 130–1.
- Katherine, Berrin; Museum, Larco (1997). The Spirit of Ancient Peru: Treasures from the Museo Arqueológico Rafael Larco Herrera. New York: Thames and Hudson. ISBN 978-0-500-01802-6.
- Chung Tai World (2009). "The Parrot who Extinguished a Forest Fire". Chung Tai Monastery. Retrieved 6 August 2016.
- Idema, Wilt L. (2008). Personal salvation and filial piety: two precious scroll narratives of Guanyin and her acolytes. University of Hawaii Press. p. 33. ISBN 978-0-8248-3215-5.
- "Dominica Flags and Symbols and National Anthem". World Atlas. Retrieved 9 August 2016.
- "The National Bird". The Government of St. Vincent and the Grenadines Ministry of Foreign Affairs, Trade and Commerce. Retrieved 5 August 2016.
- Quinion, Michael (10 June 2000). "Sick as a.". World Wide Words. Retrieved 13 October 2011.
- Swithenbank, G. "Expressions and Sayings". Retrieved 13 October 2011.
- Behn, Aphra (1681). "The False Count". Project Gutenberg.
'Lord, Madam, you are as melancholy as a sick Parrot.' 'And can you blame me, Jacinta? have I not many Reasons to be sad?'
- "What is a Parrot Head?". Parrot Heads of North Carolina. Retrieved 3 July 2016.
- "PsittaScene Magazine". World Parrot Trust. Retrieved 3 July 2016.
- Gosnell, Raja (Director) (1997). Home Alone 3 (Motion picture). 20th Century Fox.
- "Rio the Movie Synopsis". Fandango. 2011. Retrieved 9 August 2016.
- "The Wild Parrots of Telegraph Hill". Internet Movie Database. 2005. Retrieved 9 August 2016.
- Department of Conservation (2008). "DOC's work with rainbow lorikeet". Retrieved 14 July 2008.
- Toft, Catherine A.; Wright, Timothy F. (2015). "Parrots as Invasive Species". Parrots of the Wild: A Natural History of the World's Most Captivating Birds (1 ed.). Oakland, California: University of California Press. p. 248. ISBN 978-0-520-96264-4.
- Butler, Christopher J. (2005). "Feral Parrots in the Continental United States and United Kingdom: Past, Present, and Future". Journal of Avian Medicine and Surgery. 19 (2): 142–149. doi:10.1647/183.
- Lepore, Jill (1 June 2009). "It's Spreading". The New Yorker. New York: 27–29. Retrieved 13 September 2011.
- BirdLife International (2012). "Nestor productus". IUCN Red List of Threatened Species. Version 2012.1. International Union for Conservation of Nature. Retrieved 7 August 2016.
- "Natural Resources – Endangered and Threatened Species". USDA. Retrieved 2013-08-21.
- "IUCN Red List of Threatened Species". IUCN. 2006. Archived from the original on June 27, 2014. Retrieved 31 August 2007.
- Campbell, T. S. (December 2000). "The Monk Parakeet". The Institute for Biological Invasions. Archived from the original on 2007-07-01.
- Moorhouse, Ron; Greene, Terry; Dilks, Peter; Powlesland, Ralph; Moran, Les; Taylor, Genevieve; Jones, Alan; Knegtmans, Jaap; Wills, Dave; Pryde, Moira; Fraser, Ian; August, Andrew; August, Claude (2002). "Control of introduced mammalian predators improves kaka Nestor meridionalis breeding success: reversing the decline of a threatened New Zealand parrot". Biological Conservation. 110 (1): 33–44. doi:10.1016/S0006-3207(02)00173-8.
- White, Jr., Thomas H.; Collazo, Jaime A.; Vilella, Francisco J.; Guerrero, Simón A. (2005). "Effects of Hurricane Georges on Habitat Used by Captive-Reared Hispaniola Parrots (Amazona ventralis) Released in the Dominican Republic" (PDF). Ornitologia Neotropical. 16: 405–417.
- "Current homepage". The World Parrot Trust.
- "Our publications: PsittaScene Magazine". World Parrot Trust.
- Snyder, N.; McGowan, P.; Gilardi, J.; Grajal, A. (2000). Parrots: Status Survey and Conservation Action Plan, 2000–2004. International Union for Conservation of Nature. ISBN 978-2-8317-0504-0.
- "Rainbow Lorikeet". Beauty of Birds. 2011. Retrieved 9 August 2016.
- Christian, C; Potts, T; Burnett, G; Lacher, Jr (1999). "Parrot Conservation and Ecotourism in the Windward Islands". Journal of Biogeography. 23 (3): 387–393. doi:10.1046/j.1365-2699.1996.00041.x.
- Kakapo Recovery Programme (2010). "Then and Now". Kakapo Recovery Programme. Retrieved 1 April 2010.
- Barré, Nicholas; Theuerkauf, Jörn; Verfaille, Ludovic; Primot, Pierre and Maurice Saoumoé (2010). "Exponential population increase in the endangered Ouvéa Parakeet (Eunymphicus uvaeensis) after community-based protection from nest poaching". Journal of Ornithology. 151 (3): 695–701. doi:10.1007/s10336-010-0499-7.
- Cooney, Stuart J. N. (2009). Ecological Association of the Hooded Parrot (Psephotus dissimilis) (PDF) (Thesis). Australian National University. p. 13.
- BirdLife International (2013). "Charmosyna diadema". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 8 August 2016.
- A group of 226 non-governmental organisations (2005-05-19). "The European Union Wild Bird Declaration" (PDF). birdsareforwatching.org.
- "CITES Information". American Federation of Aviculture. Retrieved 6 August 2016.
- Cameron, Matt (2007). Cockatoos. Collingwood, VIC, Australia: CSIRO Publishing. ISBN 978-0-643-09232-7.
- Parrot videos on the Internet Bird Collection