Temporal range: 38–0 Ma Late Eocene – Recent
G. Fischer de Waldheim, 1817
Bears are carnivoran mammals of the family Ursidae. Bears are classified as caniforms, or doglike carnivorans. Although only eight species of bears are extant, they are widespread, appearing in a wide variety of habitats throughout the Northern Hemisphere and partially in the Southern Hemisphere. Bears are found on the continents of North America, South America, Europe, and Asia. Common characteristics of modern bears include large bodies with stocky legs, long snouts, small rounded ears, shaggy hair, plantigrade paws with five nonretractile claws, and short tails. While the polar bear is mostly carnivorous, and the giant panda feeds almost entirely on bamboo, the remaining six species are omnivorous with varied diets.
With the exception of courting individuals and mothers with their young, bears are typically solitary animals. They are generally diurnal, but may be active during the night (nocturnal) or twilight (crepuscular), particularly around humans. Bears possess an excellent sense of smell and, despite their heavy build and awkward gait, are adept runners, climbers, and swimmers. Bears use shelters, such as caves and burrows, as their dens; most species occupy their dens during the winter for a long period of hibernation, up to 100 days.
Bears have been hunted since prehistoric times for their meat and fur; they have been used for bear-baiting and other forms of entertainment, such as being made to dance. With their powerful physical presence, they play a prominent role in the arts, mythology, and other cultural aspects of various human societies. In modern times, bears have come under pressure through encroachment on their habitats and illegal trade in bear parts, including the Asian bile bear market. The IUCN lists six bear species as vulnerable or endangered, and even least concern species, such as the brown bear, are at risk of extirpation in certain countries. The poaching and international trade of these most threatened populations are prohibited, but still ongoing.
- 1 Etymology
- 2 Evolution and phylogeny
- 3 Biology
- 4 Relationship with humans
- 5 See also
- 6 Notes
- 7 References
- 8 Further reading
- 9 External links
The English word "bear" comes from Old English bera and belongs to a family of names for the bear in Germanic languages, such as Swedish björn, also used as a first name, that originate from an adjective meaning "brown".
Bear taxon names such as Arctoidea and Helarctos come from the ancient Greek word ἄρκτος (arktos), meaning bear, as do the names "arctic" and "antarctic", from the constellation Ursa Major, the "Great Bear", prominent in the northern sky.
Bear taxon names such as Ursidae and Ursus come from Latin Ursus/Ursa, he-bear/she-bear. The female first name "Ursula", originally derived from a Christian saint's name, means "little she-bear" (diminutive of Latin ursa). In Switzerland, the male first name "Urs" is especially popular, while the name of the canton and city of Bern is derived from Bär, German for bear. The Germanic name Bernard (including Bernhardt and similar forms) means "bear-brave", "bear-hardy", or "bold bear". The Old English name Beowulf is a kenning, "bee-wolf", for bear, in turn meaning a brave warrior.
Evolution and phylogeny
The family Ursidae is one of nine families in the suborder Caniformia, or "doglike" carnivores, within the order Carnivora. Bears' closest living relatives are the pinnipeds, canids, and musteloids. Modern bears comprise eight species in three subfamilies: Ailuropodinae (monotypic with the giant panda), Tremarctinae (monotypic with the spectacled bear), and Ursinae (containing six species divided into one to three genera, depending on the authority). Nuclear chromosome analysis show that the karyotype of the six ursine bears is nearly identical, with each having 74 chromosomes, whereas the giant panda has 42 chromosomes and the spectacled bear 52. These smaller numbers can be explained by the fusing of some chromosomes, and the banding patterns on these match those of the ursine species, but differ from those of procyonids, which supports the inclusion of these two species in Ursidae rather than in Procyonidae, where they had been placed by some earlier authorities.
The earliest members of Ursidae belong to the extinct subfamily Amphicynodontinae, including Parictis (late Eocene to early middle Miocene, 38–18 Mya) and the slightly younger Allocyon (early Oligocene, 34–30 Mya), both from North America. These animals looked very different from today's bears, being small and raccoon-like in overall appearance, and diets perhaps more similar to that of a badger. Parictis does not appear in Eurasia and Africa until the Miocene. It is unclear whether late-Eocene ursids were also present in Eurasia, although faunal exchange across the Bering land bridge may have been possible during a major sea level low stand as early as the late Eocene (about 37 Mya) and continuing into the early Oligocene. European genera morphologically are very similar to Allocyon, and to the much younger American Kolponomos (about 18 Mya), are known from the Oligocene, including Amphicticeps and Amphicynodon.
The raccoon-sized, dog-like Cephalogale is the oldest-known member of the subfamily Hemicyoninae, which first appeared during the middle Oligocene in Eurasia about 30 Mya ago. The subfamily includes the younger genera Phoberocyon (20–15 Mya), and Plithocyon (15–7 Mya). A Cephalogale-like species gave rise to the genus Ursavus during the early Oligocene (30–28 Mya); this genus proliferated into many species in Asia and is ancestral to all living bears. Species of Ursavus subsequently entered North America, together with Amphicynodon and Cephalogale, during the early Miocene (21–18 Mya). Members of the living lineages of bears diverged from Ursavus between 15 and 20 Mya ago, likely via the species Ursavus elmensis. Based on genetic and morphological data, the Ailuropodinae (pandas) were the first to diverge from other living bears about 19 Mya ago, although no fossils of this group have been found before about 5 Mya.
The New World short-faced bears (Tremarctinae) differentiated from Ursinae following a dispersal event into North America during the mid-Miocene (about 13 Mya). They invaded South America (≈1 Ma) following formation of the Isthmus of Panama. Their earliest fossil representative is Plionarctos in North America (~ 10–2 Ma). This genus is probably the direct ancestor to the North American short-faced bears (genus Arctodus), the South American short-faced bears (Arctotherium), and the spectacled bears, Tremarctos, represented by both an extinct North American species (T. floridanus), and the lone surviving representative of the Tremarctinae, the South American spectacled bear (T. ornatus).
The subfamily Ursinae experienced a dramatic proliferation of taxa about 5.3–4.5 Mya ago, coincident with major environmental changes; the first members of the genus Ursus appeared around this time. The sloth bear is a modern survivor of one of the earliest lineages to diverge during this radiation event (5.3 Mya); it took on its peculiar morphology, related to its diet of termites and ants, no later than by the early Pleistocene. By 3–4 Mya ago, the species Ursus minimus appears in the fossil record of Europe; apart from its size, it was nearly identical to today's Asian black bear. It is likely ancestral to all bears within Ursinae, perhaps aside from the sloth bear. Two lineages evolved from U. minimus: the black bears (including the sun bear, the Asian black bear, and the American black bear); and the brown bears (which includes the polar bear). Modern brown bears evolved from U. minimus via Ursus etruscus, which itself is ancestral to both the extinct Pleistocene cave bear and today's brown and polar bears. Species of Ursinae have migrated repeatedly into North America from Eurasia as early as 4 Mya during the early Pliocene.
The phylogeny of extant bear species is shown in a cladogram based on complete mitochondrial DNA sequences from Yu et al., 2007. The giant panda, followed by the spectacled bear are clearly the oldest species. The relationships of the other species are not very well resolved, though the polar bear and the brown bear form a close grouping.
Extant species are shown in bold, extinct taxa are marked †.
- Family Ursidae
- Subfamily Ailuropodinae
- Subfamily Tremarctinae
- † Plionarctos
- † Plionarctos edensis
- † Plionarctos harroldorum
- Tremarctos (spectacled bears)
- † Arctodus
- † Arctodus simus – giant short-faced bear
- † Arctodus pristinus
- † Arctotherium
- † Arctotherium angustidens
- † Arctotherium bonariense
- † Arctotherium brasilense
- † Arctotherium latidens
- † Arctotherium tarijense
- † Arctotherium vetustum
- † Arctotherium wingei
- † Plionarctos
- Subfamily Ursinae
- † Ursavus
- † Ursavus brevirhinus
- † Ursavus depereti
- † Ursavus elmensis
- † Ursavus pawniensis
- † Ursavus primaevus
- † Ursavus tedfordi
- † Indarctos
- † Indarctos anthraciti
- † Indarctos arctoides
- † Indarctos atticus
- † Indarctos nevadensis
- † Indarctos oregonensis
- † Indarctos salmontanus
- † Indarctos vireti
- † Indarctos zdanskyi
- † Agriotherium
- † Agriotherium inexpetans
- † Agriotherium schneideri
- † Agriotherium sivalensis
- Melursus ursinus – sloth bear
- Helarctos malayanus – sun bear
- † Ursus rossicus
- † Ursus sackdillingensis
- † Ursus minimus
- Ursus thibetanus – Asian black bear
- † Ursus abstrusus
- Ursus americanus – American black bear
- † Ursus etruscus
- Ursus arctos – brown bear
- Ursus maritimus – polar bear
- † Ursus savini
- † Ursus deningeri
- † Ursus spelaeus – cave bear
- † Ursus inopinatus, MacFarlane's bear (cryptid; possibly a hybrid)
- † Ursavus
- † Kolponomos
- † Kolponomos clallamensis
- † Kolponomos newportensis
The genera Melursus and Helarctos are sometimes included in Ursus. The Asian black bear and the polar bear used to be placed in their own genera, Selenarctos and Thalarctos; these names have since been reduced in rank to subgenera.
Bears include the most massive extant terrestrial members of the order Carnivora. Polar bears weigh up to 1,600 lb (730 kg). The smallest are the sun bears of Asia, which weigh up to 150 lb (68 kg). Body weight varies throughout the year in bears of temperate and arctic climates, as they build up fat reserves in the summer and autumn and lose weight during the winter. Head-and-body length can range from 150 cm (59 in) in sun bears to 244 cm (96 in) in polar bears.
Bears are generally bulky and robust animals with short tails. They are sexually dimorphic with regard to size, with the males being larger. Larger species tend to show increased levels of sexual dimorphism in comparison to smaller species. Relying as they do on strength rather than speed, bears have relatively short limbs with thick bones to support their bulk. The shoulder blades and the pelvis are correspondingly massive. The limbs are much straighter than those of the big cats as there is no need for them to flex in the same way due to the differences in their gait. The strong forelimbs are used to catch prey, to excavate dens, to dig out burrowing animals, to turn over rocks and logs to locate prey, and to club large creatures.
Unlike most other land carnivorans, bears are plantigrade. They distribute their weight toward the hind feet, which makes them look lumbering when they walk. They are capable of bursts of speed but soon tire, and as a result mostly rely on ambush rather than the chase. Bears can stand on their hind feet and sit up straight with remarkable balance. Their front paws are flexible enough to grasp fruit and leaves. Bears' non-retractable claws are used for digging, climbing, tearing, and catching prey. The claws on the front feet are larger than those on the back and may be a hindrance when climbing trees; black bears are the most arboreal of the bears, and have the shortest claws. Pandas are unique in having a bony extension on the wrist of the front feet which acts as a thumb, and is used for gripping bamboo shoots as the animals feed.
Most mammals have agouti hair, with each individual hair shaft having bands of colour corresponding to two different types of melanin pigment. Bears however have a single type of melanin and the hairs have a single colour throughout their length, apart from the tip which is sometimes a different shade. The coat consists of long guard hairs, which form a protective shaggy covering, and short dense hairs which form an insulating layer trapping air close to the skin. The shaggy coat helps maintain body heat during winter hibernation and is shed in the spring leaving a shorter summer coat. Polar bears have hollow, translucent guard hairs which gain heat from the sun and conduct it to the dark-coloured skin below. They have a thick layer of blubber for extra insulation, and the soles of their feet have a dense pad of fur. Other than the bold black-and-white pelage of the panda, bears tend to be uniform in colour, although some species may have markings on the chest or face.
Bears have small rounded ears so as to minimise heat loss, but both their hearing and sight are not particularly acute. Unlike many other carnivores they have colour vision, perhaps to help them distinguish ripe nuts and fruits. They are unique among carnivores in not having touch-sensitive whiskers on the muzzle, however they have an excellent sense of smell, better than that of the dog (Canidae), or possibly any other mammal. They use smell for signalling to each other (either to warn off rivals or detect mates) and for finding food. Smell is the principal sense used by bears to locate most of their food, and they have excellent memories which helps them to relocate places where they have found food before.
The skulls of bears are massive, providing anchorage for the powerful masseter and temporal jaw muscles. The canine teeth are large but mostly used for display, and the molar teeth flat and crushing. Unlike most other members of the Carnivora, bears have relatively undeveloped carnassial teeth, and their teeth are adapted for a diet that includes a significant amount of vegetable matter. Considerable variation occurs in dental formula even within a given species. This may indicate bears are still in the process of evolving from a mainly meat-eating diet to a predominantly herbivorous one. Polar bears appear to have secondarily re-evolved carnassial-like cheek teeth, as their diets have switched back towards carnivory. Sloth bears lack lower central incisors and use their protusible lips for sucking up the termites on which they feed. The general dental formula for living bears is: 3.1.2–4.2. The structure of the larynx of bears appears to be the most basal of the caniforms. They possess air pouches connected to the pharynx which may amplify their vocalisations.
Bears have a fairly simple digestive system typical for carnivorans, with a single stomach, short undifferentiated intestines and no cecum. Even the herbivorous giant panda still has the digestive system of a carnivore, as well as carnivore-specific genes. Its ability to digest cellulose is ascribed to the microbes in its gut. Bears must spend much of their time feeding in order to gain enough nutrition from plant matter. The panda, in particular, spends 12-15 hours a day feeding.
Distribution and habitat
Bears are found in sixty countries primarily in the Northern Hemisphere, being concentrated in Asia, North America, and Europe. An exception is the spectacled bear; native to South America it inhabits the Andean region. The sun bear's range extends below the equator in Southeast Asia. The Atlas bear, a subspecies of the brown bear, was the only bear native to Africa. It was distributed in North Africa from Morocco to Libya, but it became extinct around the 1870s. The most widespread species is the brown bear, which occurs from Western Europe eastwards through Asia to the western areas of North America. The American black bear is restricted to North America, and the polar bear is restricted to the Arctic Sea. All the remaining species of bear are Asian. They occur in a range of habitats which include tropical lowland rainforest, both coniferous and broadleaf forests, prairies, steppes, montane grassland, alpine scree slopes and Arctic tundra. Bears may dig their dens in hillsides or use caves, hollow logs and dense vegetation for shelter.
Brown and American black bears are generally diurnal, meaning that they are active for the most part during the day, though they may forage substantially by night. Other species may be nocturnal, active at night, though female sloth bears with cubs may feed more at daytime to avoid competition from conspecifics and nocturnal predators. Bears are overwhelmingly solitary and are considered to be the most asocial of all the Carnivora. Liaisons between breeding bears are brief, and the only times bears are encountered in small groups are mothers with young or occasional seasonal bounties of rich food (such as salmon runs). With their acute sense of smell, bears can locate carcasses from several kilometres away. They use olfaction to locate other foods, encounter mates, avoid rivals and recognise their cubs.
Bears produce a variety of vocal and non-vocal sounds such as: moaning, produced mostly as mild warnings to potential threats or in fear; barking, produced during times of alarm, excitement or to give away the animal's position; jaw-clicking and lip-popping, produced for much of the same reason as moaning and barking, huffing, made during courtship or between mother and cubs to warn of danger; growling, produced as strong warnings to potential threats; roaring, used for much the same reasons as growls, and to proclaim their presence and state of mind; and humming, a loud monotonous buzzing sound, primarily used by cubs.
Bears sometimes communicate with visual displays such as standing upright, which exaggerates the individual's size. The chest markings of some species may add to this intimidating display. Staring is an aggressive act and the facial markings of spectacled bears and giant pandas may help draw attention to the eyes during agonistic encounters. Individuals may approach each other by stiff-legged walking with the head lowered. Dominance between bears is asserted by making a frontal orientation, showing the canine teeth, muzzle twisting and neck stretching. A subordinate may respond with a lateral orientation, by turning away and dropping the head and by sitting or lying down. Fights may occur and older males may have extensive scarring, which suggests that the maintenance of these hierarchies is intense.
Bears may mark territory by rubbing against trees and other objects which may serve to spread their scent. This is usually accompanied by clawing and biting the object. Bark may be spread around to draw attention to the marking post. Pandas are known to mark objects with urine and a waxy substance from their anal glands. Polar bears leave behind their scent in their tracks which allow individuals to keep track of one another in the vast Arctic wilderness.
Most bears have diets of more plant than animal matter and are completely opportunistic omnivores. At the extremes are the almost entirely herbivorous giant panda and the mostly carnivorous polar bear. However, all bears feed on any food source that becomes seasonally available. For example, Asiatic black bears in Taiwan consume large numbers of acorns when these are most common, and switch to ungulates at other times of the year.
When foraging for plants, bears choose to eat them at the stage when they are at their most nutritious and digestible, typically avoiding older grasses, sedges and leaves. Knowing when plants are ripe for eating is a learned behaviour. In autumn, some bear species forage large amounts of naturally fermented fruits, which affects their behaviour. Smaller bears climb trees to obtain mast (edible reproductive parts, such as acorns). Such masts can be very important to the diets of these species, and mast failures may result in long-range movements by bears looking for alternative food sources. The panda's diet is over 99% bamboo, of 30 different species. Its strong jaws are adapted for crushing these tough plants. Bamboo leaves contain the highest protein levels; stems have less. Bromeliads can make up to 50% of the diet of the spectacled bear, which also has strong jaws to bite them open.
The sloth bear, though not as specialised as polar bears and the panda, has lost several front teeth usually seen in bears, and developed a long, suctioning tongue to feed on the ants, termites, and other burrowing insects they favour. At certain times of the year, these insects can make up 90% of their diets. Sun bears use their long tongues to lick up insects and honey. Fish are an important source of food for some species, and brown bears in particular gather in large numbers at salmon runs. Typically, a bear plunges into the water and seizes a fish with its jaws or front paws. The preferred parts to eat are the brain and eggs. Small mammals like rodents and rabbit are often eaten. The brown bear and both species of black bears sometimes take large ungulates, such as deer and bovids, mostly the young and weak. The polar bear preys on marine mammals, such as seals, stalking them from the ice or breaking into their dens. They primarily eat the highly digestible blubber. Predatory behaviour in bears is typically taught to the young by the mother.
Bears are prolific scavengers and kleptoparasites, stealing food caches from rodents, and carcasses from other predators. Stable isotope analysis of the extinct giant short-faced bear (Arctodus simus) shows it was an exclusive meat-eater, probably a scavenger. For hibernating species, weight gain is important as it provides nourishment during winter dormancy. A brown bear can eat 41 kg (90 lb) of food and gain 2–3 kg (4.4–6.6 lb) of fat a day prior to entering its den.
Reproduction and life cycle
The mating system of bears has variously been described as a form of polygyny, promiscuity and serial monogamy. During the breeding season, males take notice of females in their vicinity and females become more tolerant of males. A male bear may visit a female continuously over a period of several days or weeks, depending on the species, to test her reproductive state. During this time period, males try to prevent rivals from interacting with their mate. Courtship may be brief, although in some Asian species, courting pairs may engage in wrestling, hugging, mock fighting and vocalising. Ovulation is induced by mating, which can last up to 30 minutes depending on the species.
Gestation typically lasts 6-9 months, including delayed implantation, and litter size numbers up to four cubs. Giant pandas may give birth to twins but they can only suckle one young and the other is left to die. In northern living species, birth takes place during winter dormancy. Cubs are born blind and helpless with at most a thin layer of hair. The milk of the mother bear is rich in fat and antibodies and cub may suckle for up to a year after they are born. By 2-3 months, cubs can follow their mother outside the den. They usually follow her on foot, but sloth bear cubs may ride on their mother's back. In some species, offspring may become independent around their second year, through some may stay until the female successfully mates again.
Male bears play no role in raising young. Infanticide, where an adult male kills the cubs of another, has been recorded in polar bears, brown bears and American black bears but not in other species. Males kill young to bring the female into oestrus. Cubs may flee and the mother defends them even at the cost of her life. Bears reach sexual maturity shortly after they disperse; at around 3-6 years depending on the species. Male Alaskan brown bears and polar bears may continue to grow until they are 11 years old.
Bears of northern regions, including the American black bear and the grizzly bear, hibernate in the winter. During hibernation, the bear's metabolism slows down, its body temperature decreases slightly, and its heart rate slows from a normal value of 55 to just 9 beats per minute. Bears normally do not wake during their hibernation, and can go the entire period without eating, drinking, urinating, or defecating. If they have laid up enough body fat, their muscles stay in good condition, and their protein maintenance requirements are met from recycling waste urea. Female bears give birth during the hibernation period, and are roused when doing so.
Predators, parasites and pathogens
As animals at the summit of the food chain, bears do not have many predators. The most important one is man, and as he started cultivating crops, he increasingly came in conflict with the bears that raided them. Since the invention of firearms, he has been able to kill bears with greater ease. The tiger is the only four-legged predator that regularly preys on adult bears, including brown bears, sloth bears, Asiatic black bears, and sun bears.
Bears are parasitized by eighty species of parasites, including single-celled protozoans and gastro-intestinal worms, and nematodes and flukes in their heart, liver, lungs and bloodstream. Externally they have ticks, fleas and lice. A study of American black bears found seventeen species of endoparasite including the protozoan Sarcocystis, the parasitic worm Diphyllobothrium mansonoides, and the nematodes Dirofilaria immitis, Capillaria aerophila, Physaloptera sp., Strongyloides sp. and others. Of these, D. mansonoides and adult C. aerophila were causing pathological symptoms. By contrast, polar bears have few parasites; many parasitic species need a secondary, usually terrestrial, host, and the polar bear's life style is such that few alternative hosts exist in their environment. The protozoan Toxoplasma gondii has been found in polar bears, and the nematode Trichinella nativa can cause a serious infection and decline in older polar bears. Bears in North America are sometimes infected by a Morbillivirus similar to the canine distemper virus. They are susceptible to infectious canine hepatitis (CAV-1), with free-living black bears dying rapidly of encephalitis and hepatitis.
Relationship with humans
In modern times, bears have come under pressure through encroachment on their habitats and illegal trade in bear parts, including the Asian bile bear market, though hunting is now banned, largely replaced by farming. The IUCN lists six bear species as vulnerable; even the two least concern species, the brown bear and the American black bear, are at risk of extirpation in certain areas. In general these two species inhabit remote areas with little interaction with man, and the main non-natural causes of mortality are hunting, trapping, road-kill and depredation.
Laws have been passed in many areas of the world to protect bears from habitat destruction. Public perception of bears is often positive, as people identify with bears due to their omnivorous diets, ability to stand on two legs, and symbolic importance, and support for bear protection is widespread, at least in more affluent societies. Where bears raid crops or attack livestock, they may come into conflict with humans. In poorer rural regions, attitudes may be more shaped by the dangers posed by bears and the economic costs they cause to farmers and ranchers.
Several bear species are dangerous to humans, especially in areas where they have become used to people; elsewhere, they generally avoid humans. Injuries caused by bears are rare, but are widely reported. Bears may attack humans in response to being startled, in defense of young or food, or even for predatory reasons.
Entertainment, hunting, food and folk medicine
Bears in captivity have for centuries been used for entertainment. They have been trained to dance, and were kept for baiting in Europe at least since the 16th century. There were five bear-baiting gardens in Southwark, London at that time; archaeological remains of three of these have survived. Across Europe, nomadic Romani bear handlers called Ursari lived by busking with their bears from the 12th century.
Bears have been hunted for sport, food, and folk medicine. Their meat is dark and stringy, like a tough cut of beef. In Cantonese cuisine, bear paws are considered a delicacy. Bear meat should be cooked thoroughly, as it can be infected with the parasite Trichinella spiralis.
The peoples of eastern Asia use bears' body parts and secretions (notably their gallbladders and bile) as part of traditional Chinese medicine. More than 12,000 bears are thought to be kept on farms in China, Vietnam, and South Korea for the production of bile. Trade in bear products is prohibited under CITES, but bear bile has been detected in shampoos, wine and herbal medicines sold in Canada, the United States and Australia.
Literature, art and symbolism
There is evidence of prehistoric bear worship, though this is disputed by archaeologists. The prehistoric Finns, Siberian peoples and more recently Koreans considered the bear as the spirit of their forefathers. There is evidence of bear worship in early Chinese and Ainu cultures. In many Native American cultures, the bear is a symbol of rebirth because of its hibernation and re-emergence. The image of the mother bear was prevalent throughout societies in North America and Eurasia, based on the female's devotion and protection of her cubs.
The constellations of Ursa Major and Ursa Minor, the great and little bears, are named for their supposed resemblance to bears, from the time of Ptolemy.[a] The nearby star Arcturus means "guardian of the bear", as if it were watching the two constellations. Ursa Major has been associated with a bear for as much as 13,000 years since Paleolithic times, in the widespread Cosmic Hunt myths. These are found on both sides of the Bering land bridge, which was lost to the sea some 11,000 years ago.
Pliny the Elder's Natural History (1st century AD) claims that "when first born, [bears] are shapeless masses of white flesh, a little larger than mice; their claws alone being prominent. The mother then licks them gradually into proper shape." This belief was echoed by authors of bestiaries throughout the medieval period.
Legends of saints taming bears are common in the Alpine zone. In the arms of the bishopric of Freising, the bear is the dangerous totem animal tamed by St. Corbinian and made to carry his civilised baggage over the mountains. Bears similarly feature in the legends of St. Romedius, Saint Gall and Saint Columbanus. This recurrent motif was used by the Church as a symbol of the victory of Christianity over paganism. In the Norse settlements of northern England during the 10th century, a type of "hogback" grave cover of a long narrow block of stone, with a shaped apex like the roof beam of a long house, is carved with a muzzled, thus Christianised, bear clasping each gable end, as in the church at Brompton, North Yorkshire and across the British Isles.
Bears are popular in children's stories, including "Goldilocks and the Three Bears", Winnie the Pooh, Paddington Bear, and "The Brown Bear of Norway". The cartoon character Yogi Bear has appeared in numerous comic books, animated television shows and films. Around the world, many children have teddy bears, stuffed toys in the form of bears.
Onikuma from Ehon Hyaku Monogatari, c. 1841
St Corbinian orders the bear that killed his horse to carry his load.
The Russian Bear has been a common national personification for Russia from the 16th century onwards. Smokey Bear has become a part of American culture since his introduction in 1944, with his message "Only you can prevent wildfires". In the UK, the bear and staff feature on the heraldic arms of the county of Warwickshire. Bears appear in the canting arms of two cities, Bern and Berlin, both of whose names include the word "bear".
The International Association for Bear Research & Management, also known as the International Bear Association, and the Bear Specialist Group of the Species Survival Commission, a part of the International Union for Conservation of Nature focus on the natural history, management, and conservation of bears. Bear Trust International works for wild bears and other wildlife through four core program initiatives, namely Conservation Education, Wild Bear Research, Wild Bear Management, and Habitat Conservation.
Specialty organizations for each of the eight species of bears worldwide include:
- Vital Ground, for the brown bear
- Moon Bears, for the Asiatic black bear
- Black Bear Conservation Coalition, for the North American black bear
- Polar Bears International, for the polar bear
- Bornean Sun Bear Conservation Centre, for the sun bear
- Wildlife SOS, for the sloth bear
- Andean Bear Conservation Project, for the Andean bear
- Chengdu Research Base of Giant Panda Breeding, for the giant panda
- Ptolemy named the constellations in Greek, Ἄρκτος μεγάλη (Arktos Megale) and Ἄρκτος μικρά (Arktos Mikra), the great and little bears.
- "bear (n.)". Online Etymology Dictionary. Retrieved 22 January 2017.
- Liddell, Henry George; Scott, Robert. "Arktos". A Greek-English Lexicon. Perseus Digital Library.
- "The Great Bear Constellation Ursa Major". Archived from the original on 30 November 2010. Retrieved 12 January 2017.
- "Ursa Major – the Greater Bear". constellationsofwords.com. Retrieved 11 March 2015.
- "Bernhard Family History". ancestry.com. Retrieved 11 March 2015.
- Sweet, Henry (1884) Anglo-Saxon Reader in Prose and Verse. The Clarendon Press, p. 202.
- Welsey-Hunt, G. D.; Flynn, J. J. (2005). "Phylogeny of the Carnivora: basal relationships among the Carnivoramorphans, and assessment of the position of 'Miacoidea' relative to Carnivora". Journal of Systematic Palaeontology. 3 (1): 1–28. doi:10.1017/S1477201904001518.
- Servheen, Christopher (1999). Bears: Status Survey and Conservation Action Plan. IUCN. pp. 26–30. ISBN 978-2-8317-0462-3.
- Kemp, T. S. (2005). The Origin and Evolution of Mammals. Oxford University Press. p. 260. ISBN 978-0-19-850760-4.
- Banyue, Wang; Zhanxiang, Qiu (2005). "Notes on Early Oligocene Ursids (Carnivora, Mammalia) from Saint Jacques, Nei Mongol, China" (PDF). Bulletin of the American Museum of Natural History. 279 (279): 116–124. doi:10.1206/0003-0090(2003)279<0116:C>2.0.CO;2. Archived (PDF) from the original on 2009-11-20.
- Tedford, R. H.; Barnes, L. G.; Ray, C. E. (1994). "The early Miocene littoral ursoid carnivoran Kolponomos: Systematics and mode of life" (PDF). Proceedings of the San Diego Society of Natural History. 29: 11–32.
- Waits, Lisette (1999). "Rapid radiation events in the family Ursidae indicated by likelihood phylogenetic estimation from multiple fragments of mtDNA" (PDF). Molecular Phylogenetics and Evolution. 13: 82–92. doi:10.1006/mpev.1999.0637.
- Pàges, Marie (2008). "Combined analysis of fourteen nuclear genes refines the Ursidae phylogeny". Molecular Phylogenetics and Evolution. 47: 73–83. doi:10.1016/j.ympev.2007.10.019.
- Krause, J.; Unger, T.; Noçon, A.; Malaspinas, A.; Kolokotronis, S.; Stiller, M.; Soibelzon, L.; Spriggs, H.; Dear, P. H.; Briggs, A. W.; Bray, S. C. E.; O'Brien, S. J.; Rabeder, G.; Matheus, P.; Cooper, A.; Slatkin, M.; Pääbo, S.; Hofreiter, M. (2008). "Mitochondrial genomes reveal an explosive radiation of extinct and extant bears near the Miocene-Pliocene boundary". BMC Evolutionary Biology. 8 (220): 220. doi:10.1186/1471-2148-8-220. PMC . PMID 18662376.
- Soibelzon, L. H.; Tonni, E. P.; Bond, M. (2005). "The fossil record of South American short-faced bears (Ursidae, Tremarctinae)". Journal of South American Earth Sciences. 20 (1–2): 105–113. doi:10.1016/j.jsames.2005.07.005.
- Qiu Zhanxiang (2003). "Dispersals of Neogene Carnivorans between Asia and North America" (PDF). Bulletin of the American Museum of Natural History. 279 (279): 18–31. doi:10.1206/0003-0090(2003)279<0018:C>2.0.CO;2. Archived (PDF) from the original on 20 November 2009.
- Flynn, J. J.; Finarelli, J. A.; Zehr, S.; Hsu, J.; Nedbal, M. A. (2005). "Molecular phylogeny of the Carnivora (Mammalia): Assessing the impact of increased sampling on resolving enigmatic relationships". Systematic Biology. 54 (2): 317–37. doi:10.1080/10635150590923326. PMID 16012099.
- Yu, Li; Li, Yi-Wei; Ryder, Oliver A.; Zhang, Ya-Ping (2007). "Analysis of complete mitochondrial genome sequences increases phylogenetic resolution of bears (Ursidae), a mammalian family that experienced rapid speciation". BMC Evolutionary Biology. 7 (198). doi:10.1186/1471-2148-7-198.
- "Polar Bear". National Geographic. Retrieved 22 January 2017.
- "Sun Bear". National Geographic. Retrieved 22 January 2017.
- Anon (2010). Mammal Anatomy: An Illustrated Guide. Marshall Cavendish. pp. 104–123. ISBN 978-0-7614-7882-9.
- Derocher, Andrew E.; Andersen, Magnus; Wiig, Øystein (2005). "Sexual dimorphism of polar bears" (PDF). Journal of Mammalogy. 86 (5): 895–901. doi:10.1644/1545-1542(2005)86[895:SDOPB]2.0.CO;2.
- Hunt, R. M. Jr. (1998). "Ursidae". In Janis, Christine M.; Scott, Kathleen M.; Jacobs, Louis L. Evolution of Tertiary Mammals of North America, volume 1: Terrestrial carnivores, ungulates, and ungulatelike mammals. Cambridge, England: Cambridge University Press. pp. 174–195. ISBN 978-0-521-35519-3.
- Ward and Kynaston, pp. 124–125
- Bunnell, Fred (1984). Macdonald, D., ed. The Encyclopedia of Mammals. Facts on File. p. 87. ISBN 978-0-87196-871-5.
- Ward and Kynaston, pp. 117–121
- Weissengruber, G. E.; Forstenpointner, G.; Kübber-Heiss, A.; Riedelberger, K.; Schwammer, H.; Ganzberger, K. (2001). "Occurrence and structure of epipharyngeal pouches in bears (Ursidae)". Journal of Anatomy. 198 (3): 309–14. doi:10.1046/j.1469-7580.2001.19830309.x. PMC . PMID 11322723.
- Schwartz, C. C.; Miller, S. D.; Haroldson, M. A. "Grizzly Bear". In Feldhamer, G.; Thompson, B.; Chapman, J. Wild Mammals of North America; biology, management and conservation. Johns Hopkins University Press. p. 562. ISBN 978-0801874161.
- "Food Habits of Grizzly Bears and Black Bears in the Yellowstone Ecoystem". National Park Service. Retrieved 18 January 2017.
- Ruiqiang Li; Tian, Geng; Zhu, Hongmei; He, Lin; Cai, Jing; Huang, Quanfei; Cai, Qingle; Li, Bo; Bai, Yinqi; Zhang, Zhihe; Zhang, Yaping; Wang, Wen; Li, Jun; Wei, Fuwen; Li, Heng; Jian, Min; Li, Jianwen; Zhang, Zhaolei; Nielsen, Rasmus; Li, Dawei; Gu, Wanjun; Yang, Zhentao; Xuan, Zhaoling; Ryder, Oliver A.; Leung, Frederick Chi-Ching; Zhou, Yan; Cao, Jianjun; Sun, Xiao; et al. (2010). "The sequence and de novo assembly of the giant panda genome". Nature. 463 (21): 311–317. Bibcode:2010Natur.463..311L. doi:10.1038/nature08696. PMC . PMID 20010809.
- Ward and Kynaston, p. 83
- Servheen, Christopher (1999). Bears: Status Survey and Conservation Action Plan. IUCN. pp. 5–10. ISBN 978-2-8317-0462-3.
- Ward and Kynaston, p.52
- Hamdine, Watik; Thévenot, Michel; Michaux, Jacques (1998). "Histoire récente de l'ours brun au Maghreb". Comptes Rendus de l'Académie des Sciences (in French). 321 (7): 565–570. doi:10.1016/S0764-4469(98)80458-7.
- Nowak, R. M. (2005). Walker's Carnivores of the World. Johns Hopkins University Press. p. 114. ISBN 978-0801880322.
- Klinka, D. R.; Reimchen, T. E. (2002). "Nocturnal and diurnal foraging behaviour of brown bears ( Ursus arctos ) on a salmon stream in coastal British Columbia" (PDF). Canadian Journal of Zoology. 80: 1317–1322. doi:10.1139/Z02-123.
- Ward and Kynaston, 99
- Sandell, M. (1989). "The mating tactics and spacing patterns of solitary carnivores". Carnivore behavior, ecology, and evolution. Springer. pp. 164–182. doi:10.1007/978-1-4613-0855-3_7. ISBN 978-1-4613-0855-3.
- Stonorov, D.; Stokes, A. W. (1972). "Social behavior of the Alaska brown bear" (PDF). 2. International Association for Bear Research & Management: 232–242. doi:10.2307/3872587.
- "Vocalizations and Body Language". North American Bear Center. Retrieved 7 January 2017.
- Peters, G.; Owen, M.; Rogers, L. (2007). "Humming in bears: a peculiar sustained mammalian vocalization" (PDF). Acta Theriologica. 52 (4): 379–389. doi:10.1007/BF03194236.
- "Grizzly Vocalizations". Yellowstone National Park. Retrieved 7 January 2017.
- Jordan, R. H. (1976). "Threat behavior of the black bear (Ursus americanus)". Bears: Their Biology and Management. 40: 57–63. doi:10.2307/3872754.
- Ward and Kynaston, p. 130
- Ward and Kynaston, p. 122
- Nie, Y.; Swaisgood, R. R.; Zhang, Z.; Hu, Y.; Ma, Y.; Wei, F. (2012). "Giant panda scent-marking strategies in the wild: role of season, sex and marking surface". Animal Behaviour. 84 (1): 39–44. doi:10.1016/j.anbehav.2012.03.026.
- Owen, M. A.; Swaisgood, R. R.; Slocomb, C.; Amstrup, S. C.; Durner, G. M.; Simac, K.; Pessier, A. P. (2014). "An experimental investigation of chemical communication in the polar bear". Journal of Zoology. 295 (1): 36–43. doi:10.1111/jzo.12181.
- Ward and Kynaston, p. 83
- Hwang, Mei-Hsiu (2002). "Diets of Asiatic black bears in Taiwan, with Methodological and Geographical Comparisons" (PDF). Ursus. 13: 111–125.
- Rue, Leonard Lee (1981). Furbearing Animals of North America. Crown Publishers. p. 129. ISBN 978-0-517-53942-2.
- Mattson, David J. (1998). "Diet and Morphology of Extant and Recently Extinct Northern Bears". Ursus, A Selection of Papers from the Tenth International Conference on Bear Research and Management, Fairbanks, Alaska, July 1995, and Mora, Sweden, September 1995. 10: 479–496. JSTOR 3873160.
- Ryan, Christopher; Pack, James C.; Igo, William K.; Billings, Anthony (2007). "Influence of mast production on black bear non-hunting mortalities in West Virginia". Ursus. 18 (1): 46–53. doi:10.2192/1537-6176(2007)18[46:IOMPOB]2.0.CO;2.
- Lumpkin, Susan; Seidensticker, John (2007). Giant Pandas. Collins. p. 63. ISBN 0-06-120578-8.
- Ward and Kynaston, pp. 89–92
- Dolberg, Frands (1 August 1992). "Progress in the utilization of urea-ammonia treated crop residues: biological and socio-economic aspects of animal production and application of the technology on small farms". University of Arhus. Retrieved 10 August 2010.
- Ward and Kynaston, p. 87
- Joshi, Anup; Garshelis, David L.; Smith, James L. D. (1997). "Seasonal and Habitat-Related Diets of Sloth Bears in Nepal". Journal of Mammalology. 1978 (2): 584–597. doi:10.2307/1382910.
- Ward and Kynaston, p. 89
- Ward and Kynaston, pp. 93–98
- Zager, Peter; Beecham, John (2006). "The role of American black bears and brown bears as predators on ungulates in North America". Ursus. 17 (2): 95–108. doi:10.2192/1537-6176(2006)17[95:TROABB]2.0.CO;2.
- Ward and Kynaston, p. 92
- COSEWIC. Canadian Wildlife Service (2002). "Assessment and Update Status Report on the Grizzly Bear (Ursus arctos)" (PDF). Environment Canada. Retrieved 8 April 2007.
- Matheus, Paul E. (1995). "Diet and Co-ecology of Pleistocene Short-Faced Bears and Brown Bears in Eastern Beringia". Quaternary Research. 44 (3): 447–453. doi:10.1006/qres.1995.1090.
- Ward and Kynaston, p. 104
- Eide, S.; Miller, S. "Brown Bear" (PDF). Alaska Department of Fish and Game. Retrieved 14 January 2016.
- Ward and Kynaston, pp. 138–141
- Lariviere, S. (2001). "Ursus americanus" (PDF). Mammalian Species. 647: 1–11. doi:10.1644/1545-1410(2001)647<0001:ua>2.0.co;2.
- Ward and Kynaston, pp. 144-148
- "Panda Facts". Pandas International. Retrieved 26 August 2015.
- Ward and Kynaston, p. 132
- Bellemain, E.; Zedrosser, A.; Manel, S.; Waits, L. P.; Taberlet, P.; Swenson, J. E. (2006). "The dilemma of female mate selection in the brown bear, a species with sexually selected infanticide". Proceedings of the Royal Society of London B: Biological Sciences. 273 (1584): 283–291. doi:10.1098/rspb.2005.3331. PMC . PMID 16543170.
- Swenson, J. E.; Dahle, B.; Sandegren, F. (2001). "Intraspecific predation in Scandinavian brown bears older than cubs-of-the-year". Ursus. 12: 81–91. JSTOR 3873233.
- Mörner, T.; Eriksson, H.; Bröjer, C.; Nilsson, K.; Uhlhorn, H.,; Ågren, E.; af Segerstad, C.H.; Jansson, D.S.; Gavier-Widén, D. (2005). "Diseases and mortality in free-ranging brown bear (Ursus arctos), gray wolf (Canis lupus), and wolverine (Gulo gulo) in Sweden". Journal of wildlife diseases. 41 (2): 298–303. doi:10.7589/0090-3558-41.2.298. PMID 16107663.
- Gerhard Heldmeier (2011). "Life on low flame in hibernation". Science. 331 (6019): 866–867. doi:10.1126/science.1203192.
- Shimozuru, M.; et al. (2013). "Pregnancy during hibernation in Japanese black bears: effects on body temperature and blood biochemical profiles". Journal of Mammalogy. 94 (3): 618–627. doi:10.1644/12-MAMM-A-246.1.
- Tøien, Ø.; et al. (2011). "Hibernation in Black Bears: Independence of Metabolic Suppression from Body Temperature". Science. 331 (6019): 906–909. doi:10.1126/science.1199435. PMID 21330544.
- McTaggart Cowan, I. (1972). "The Status and Conservation of Bears (Ursidae) of the World: 1970". Bears: Their Biology and Management. 2: 343–367. doi:10.2307/3872596.
- Seryodkin, Ivan (2006). The ecology, behavior, management and conservation status of brown bears in Sikhote-Alin (in Russian). Far Eastern National University, Vladivostok, Russia. pp. 1–252.
- Geptner, V. G., Sludskii, A. A. (1972). Mlekopitaiuščie Sovetskogo Soiuza. Vysšaia Škola, Moskva. (In Russian; English translation: Heptner, V. G.; Sludskii, A. A.; Bannikov, A. G.; (1992). the Soviet Union. Volume II, Part 2: Carnivora (Hyaenas and Cats). Smithsonian Institution and the National Science Foundation, Washington DC). pp. 95–202.
- Frasef, A. (2012). Feline Behaviour and Welfare. CABI. pp. 72–77. ISBN 978-1-84593-926-7.
- David Prynn (2004). Amur tiger. Russian Nature Press. p. 115.
- Seryodkin; et al. (2003). "Denning ecology of brown bears and Asiatic black bears in the Russian Far East". Ursus. 14 (2): 159.
- Kawanishi, K.; Sunquist, M. E. (2004). "Conservation status of tigers in a primary rainforest of Peninsular Malaysia". Biological Conservation. 120: 329–344. doi:10.1016/j.biocon.2004.03.005.
- Crum, James M.; Nettles, Victor F.; Davidson, William R. (1978). "Studies on endoparasites of the black bear (Ursus americanus) in the southeastern United States". Journal of Wildlife Diseases. 14 (2): 178–186. doi:10.7589/0090-3558-14.2.178.
- Derocher, Andrew E. (2012). Polar Bears: A Complete Guide to Their Biology and Behavior. JHU Press. p. 212. ISBN 978-1-4214-0305-2.
- Emergence and Control of Zoonotic Ortho- and Paramyxovirus Diseases. John Libbey Eurotext. p. 167. ISBN 978-2-7420-0392-1.
- Williams, Elizabeth S.; Barker, Ian K. (2008). Infectious Diseases of Wild Mammals. John Wiley & Sons. p. 203. ISBN 978-0-470-34481-1.
- "Brown Bear - Threats Grizzlies: Found in 2% of their former range". WWF. Retrieved 16 January 2017.
- Bacon, Heather (12 May 2008). "Implications of bear bile farming". Vet Times. Retrieved 16 January 2017.
- "Keyword search: "Ursidae", Exact phrase, The entire database". IUCN. Retrieved 16 January 2017.
- Pelton, Michael R.; Coley, Alex B.; Eason, Thomas H.; Doan Martinez; Diana L.; Pederson, Joel A.; van Manen, Frank T.; Weaver, Keith M. (1999). Chapter 8. American Black Bear Conservation Action Plan. IUCN. pp. 144–156. ISBN 978-2-8317-0462-3.
- Kellert, Stephen (1994). "Public Attitudes toward Bears and Their Conservation". Bears: Their Biology and Management. 9 (1): 43–50. doi:10.2307/3872683. JSTOR 3872683.
- Andersone, Žanete; Ozolinš, Jānis (2004). "Public perception of large carnivores in Latvia". Ursus. 15 (2): 181–187. doi:10.2192/1537-6176(2004)015<0181:PPOLCI>2.0.CO;2.
- Goldstein, Isaac; Paisley, Susanna; Wallace, Robert; Jorgenson, Jeffrey P.; Cuesta, Francisc o; Castellanos, Armando (2006). "Andean bear–livestock conflicts: a review". Ursus. 17 (1): 8–15. doi:10.2192/1537-6176(2006)17[8:ABCAR]2.0.CO;2.
- Fredriksson, Gabriella (2005). "Human–sun bear conflicts in East Kalimantan, Indonesian Borneo". Ursus. 16 (1): 130–137. doi:10.2192/1537-6176(2005)016[0130:HBCIEK]2.0.CO;2.
- Clark, Douglas (2003). "Polar Bear–Human Interactions in Canadian National Parks, 1986–2000" (PDF). Ursus. 14 (1): 65–71.
- Than, K. (2013). "Maulings by Bears: What's Behind the Recent Attacks?". National Geographic.com. Retrieved 16 January 2017.
- Findeizen, Nikolai (2008). History of Music in Russia from Antiquity to 1800, Vol. 1: From Antiquity to the Beginning of the Eighteenth Century. Indiana University Press. p. 201. ISBN 978-0-253-02637-8.
- "Elizabethan Playhouses and Bear Baiting Arenas Given Protection". Historic England. 26 September 2016. Retrieved 4 January 2017.
- Fraser, Angus M. (1995). The Gypsies. Blackwell. pp. 45–48, 226. ISBN 0-631-19605-6.
- "Trichinellosis Associated with Bear Meat". Archived from the original on 30 September 2006. Retrieved 4 October 2006.
- "Bear meat poisoning in Siberia". BBC News. 21 December 1997. Retrieved 4 October 2006.
- Black, Richard (11 June 2007). "BBC Test kit targets cruel bear trade". BBC News. Archived from the original on 18 November 2010. Retrieved 1 January 2010.
- Wunn, Ina (2000). "Beginning of Religion". Numen. 47 (4): 417–452. doi:10.1163/156852700511612.
- Bonser, Wilfrid (1928). "The mythology of the Kalevala, with notes on bear-worship among the Finns". Folklore. 39 (4): 344–358. doi:10.1080/0015587x.1928.9716794. JSTOR 1255969.
- Chaussonnet, Valerie (1995). Native Cultures of Alaska and Siberia. Washington, D.C.: Arctic Studies Center. p. 112. ISBN 1-56098-661-1.
- Lee, Jung Young (1981). Korean Shamanistic Rituals. Mouton De Gruyter. pp. 14, 20. ISBN 9-027-93378-2.
- Kindaichi, Kyōsuke; Yoshida, Minori (Winter 1949). "The Concepts behind the Ainu Bear Festival (Kumamatsuri)". Southwestern Journal of Anthropology. 5 (4): 345–350. doi:10.1086/soutjanth.5.4.3628594. JSTOR 3628594.
- Ward and Kynaston, p. 17
- Ward and Kynaston, pp. 12–13
- Ridpath, Ian. "Ptolemy's Almagest First printed edition, 1515". Retrieved 13 January 2017.
- Liddell, Henry George; Scott, Robert. "Ἀρκτοῦρος". A Greek-English Lexicon. Perseus. Retrieved 23 January 2017.
- Schaefer, Bradley E. The Origin of the Greek Constellations: Was the Great Bear constellation named before hunter nomads first reached the Americas more than 13,000 years ago?, Scientific American, November 2006, reviewed at The Origin of the Greek Constellations; Yuri Berezkin, The cosmic hunt: variants of a Siberian – North-American myth. Folklore, 31, 2005: 79-100.
- Pliny (1855). Bostock, John; Riley, Henry T., ed. Natural History. p. 8.4].
- Badke, David. "The Medieval Bestiary: Bear". Retrieved 23 January 2017.
- Pastoreau, Michel (2007). L'ours. Historie d'un roi déchu (in French). Seuil. ISBN 2-02-021542-X.
- Hall, Richard (1995). Viking Age Archaeology. pp. 43 and fig. 22. ISBN 0-7478-0063-4.
- Elms, Alan C. (July–September 1977). ""The Three Bears": Four Interpretations". The Journal of American Folklore. 90 (357). JSTOR 539519.
- "Pooh celebrates his 80th birthday". BBC News. 24 December 2005. Retrieved 23 January 2017.
- "About". Paddington.com. Retrieved 19 January 2017.
- Kennedy, Patrick, ed. (1866). "The Brown Bear of Norway". Legendary Fictions of the Irish Celts. Macmillan. pp. 57–67.
- Mallory, Michael (1998). Hanna-Barbera Cartoons. Hugh Lauter Levin. p. 44. ISBN 0-88363-108-3.
- Browne, Ray B.; Browne, Pat (2001). The Guide to United States Popular Culture. Popular Press. p. 944. ISBN 978-0-87972-821-2.
- Cannadine, David (1 February 2013). "A Point of View: The grownups with teddy bears". BBC. Retrieved 21 January 2017.
- Second Book of Kings, 2, 23–24
- "What the West thinks about Russia is not necessarily true". Telegraph. 23 April 2009. Retrieved 3 January 2017.
- "Forest Fire Prevention – Smokey Bear (1944–Present)". Ad Council. 1944-08-09. Archived from the original on 2010-11-18. Retrieved 2010-10-16.
- "Civic Heraldry of England and Wales-Warwickshire".
- "The first Buddy Bears in Berlin". Buddy Bär Berlin. 2008. Retrieved 30 January 2014.
- "Vision and Mission". Bear Trust International. 2002–2012. Retrieved 8 March 2014.
- "Vital Ground".
- "Moon Bears".
- "Black Bear Conservation Coalition".
- "Polar Bears International".
- "Bornean Sun Bear Conservation Centre".
- "Wildlife SOS".
- "Andean Bear Conservation Project".
- "Chengdu Research Base of Giant Panda Breeding".
- Bears of the World, Terry Domico, photographs by Terry Domico and Mark Newman, Facts on File, Inc., 1988, hardcover, ISBN 978-0-8160-1536-8.
- The Bear by William Faulkner.
- Brunner, Bernd (2007). Bears: A Brief History. Yale University Press.
- The Bears Project – Information, reports and images of European brown bears and other living species
- Western Wildlife Outreach – Information on the history, biology, and conservation of North American Grizzly Bears and Black Bears
- The Bear Book and Curriculum Guide – a compilation of stories about all eight species of bears worldwide, including STEM lessons rooted in bear research, ecology, and conservation