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
nocturnal and have an excellent sense of smell. Despite their heavy build and awkward gait, they are adept runners, climbers, and swimmers. Bears use shelters, such as caves and logs, 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
extirpation
in certain countries. The poaching and international trade of these most threatened populations are prohibited, but still ongoing.
Etymology
The English word "bear" comes from
Proto-Indo-European word for "brown", so that "bear" would mean "the brown one".[1][2] However, Ringe notes that while this etymology is semantically plausible, a word meaning "brown" of this form cannot be found in Proto-Indo-European. He suggests instead that "bear" is from the Proto-Indo-European word *ǵʰwḗr- ~ *ǵʰwér "wild animal".[3] This terminology for the animal originated as a taboo avoidance term: proto-Germanic tribes replaced their original word for bear—arkto—with this euphemistic expression out of fear that speaking the animal's true name might cause it to appear.[4][5] According to author Ralph Keyes, this is the oldest known euphemism.[6]
Bear taxon names such as
Helarctos come from the ancient Greek ἄρκτος (arktos), meaning bear,[7] as do the names "arctic" and "antarctic", via the name of the constellationUrsa Major, the "Great Bear", prominent in the northern sky.[8]
Bear taxon names such as Ursidae and Ursus come from Latin Ursus/Ursa, he-bear/she-bear.
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".[9][10] The Old English name Beowulf is a kenning, "bee-wolf", for bear, in turn meaning a brave warrior.[11]
The family Ursidae is one of nine families in the suborder Caniformia, or "doglike" carnivorans, within the orderCarnivora. Bears' closest living relatives are the pinnipeds, canids, and musteloids.[12] 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, each having 74 chromosomes (seeUrsid hybrid), 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.[13]
The earliest members of Ursidae belong to the extinct subfamily Amphicynodontinae, including
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.[15] European genera morphologically very similar to Allocyon, and to the much younger American Kolponomos (about 18 Mya),[16] are known from the Oligocene, including Amphicticeps and Amphicynodon.[15] There has been various morphological evidence linking amphicynodontines with pinnipeds, as both groups were semi-aquatic, otter-like mammals.[17][18][19] In addition to the support of the pinniped–amphicynodontine clade, other morphological and some molecular evidence supports bears being the closest living relatives to pinnipeds.[20][21][22][18][23][19]
Life restoration of Arctotherium bonariense
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.[15] 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,[24][25] 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, although no fossils of this group have been found before about 11 Mya.[26][27]
The New World short-faced bears (Tremarctinae) differentiated from Ursinae following a dispersal event into North America during the mid-Miocene (about 13 Mya).[26] They invaded South America (≈2.5 or 1.2 Ma) following formation of the Isthmus of Panama.[28] Their earliest fossil representative is Plionarctos in North America (c. 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).[15]
epoch
in Europe
The subfamily Ursinae experienced a dramatic proliferation of taxa about 5.3–4.5 Mya, 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, 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 the extinct Pleistocenecave bear.[26] Species of Ursinae have migrated repeatedly into North America from Eurasia as early as 4 Mya during the early Pliocene.[29][30] The polar bear is the most recently evolved species and descended from a population of brown bears that became isolated in northern latitudes by glaciation 400,000 years ago.[31]
Phylogeny
The relationship of the bear family with other carnivorans is shown in the following
molecular phylogenetic analysis of six genes in Flynn, 2005.[32]
There are two phylogenetic hypotheses on the relationships among extant and fossil bear species. One is all species of bears are classified in seven subfamilies as adopted here and related articles:
The second alternative phylogenetic hypothesis was implemented by McKenna et al. (1997) to classify all the bear species into the superfamily Ursoidea, with Hemicyoninae and Agriotheriinae being classified in the family "Hemicyonidae".
Phocoidea.[37] In the McKenna and Bell classification both bears and pinnipeds are in a parvorder of carnivoran mammals known as Ursida, along with the extinct bear dogs of the family Amphicyonidae.[37] Below is the cladogram based on McKenna and Bell (1997) classification:[37][clarification needed
The phylogeny of extant bear species is shown in a cladogram based on complete mitochondrial DNA sequences from Yu et al. (2007)[38] 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.[13]
Polar bear (left) and sun bear, the largest and smallest species respectively, on average
The bear family includes the most massive extant terrestrial members of the order Carnivora.
South American short-faced bears were the largest species known to have lived. The latter estimated to have weighed 1,600 kg (3,500 lb) and stood 3.4 m (11 ft 2 in) tall.[43][44] 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.[45]
Bears are generally bulky and robust animals with short tails. They are sexually dimorphic with regard to size, with males typically being larger.[46][47] Larger species tend to show increased levels of sexual dimorphism in comparison to smaller species.[47] 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, excavate dens, dig out burrowing animals, turn over rocks and logs to locate prey, and club large creatures.[45]
quadrupeds, bears can stand and sit as humans do, as demonstrated by this American black bear
.
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.[45]
Most mammals have agouti hair, with each individual hair shaft having bands of color corresponding to two different types of melanin pigment. Bears however have a single type of melanin and the hairs have a single color 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-colored skin below. They have a thick layer of blubber for extra insulation, and the soles of their feet have a dense pad of fur.[45] While bears tend to be uniform in color, some species may have markings on the chest or face and the giant panda has a bold black-and-white pelage.[48]
Bears have small rounded ears so as to minimize heat loss, but neither their hearing or sight are particularly acute. Unlike many other carnivorans they have
sense of smell, better than that of the dog, 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.[45]
Bears have a fairly simple digestive system typical for carnivorans, with a single stomach, short undifferentiated intestines and no cecum.[52][53] 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.[54] Bears must spend much of their time feeding in order to gain enough nutrition from foliage. The panda, in particular, spends 12–15 hours a day feeding.[55]
Extant bears are found in sixty countries primarily in the Northern Hemisphere and are concentrated in Asia, North America, and Europe. An exception is the spectacled bear; native to South America, it inhabits the Andean region.[56] The sun bear's range extends below the equator in Southeast Asia.[57] The Atlas bear, a subspecies of the brown bear was distributed in North Africa from Morocco to Libya, but it became extinct around the 1870s.[58]
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.[56] They occur in a range of habitats which include tropical lowland rainforest, both coniferous and broadleaf forests, prairies, steppes, montane grassland, alpine scree slopes, Arctic tundra and in the case of the polar bear, ice floes.[56][59] Bears may dig their dens in hillsides or use caves, hollow logs and dense vegetation for shelter.[59]
olfaction to locate other foods, encounter mates, avoid rivals and recognize their cubs.[45]
Feeding
herbivorous
.
Most bears are opportunistic
berries to insects, carrion, fresh meat, and fish, and have digestive systems and teeth adapted to such a diet.[56] 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.[55] 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.[66]
When foraging for plants, bears choose to eat them at the stage when they are at their most nutritious and digestible, typically avoiding older
Bromeliads can make up to 50% of the diet of the spectacled bear, which also has strong jaws to bite them open.[74]
Brown bear feeding on infrequent, but predictable, salmon migrations in Alaska
The sloth bear is not as specialized 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. At certain times of the year, these insects can make up 90% of their diets.[75] Some individuals become addicted to sweets in garbage inside towns where tourism-related waste is generated throughout the year.[76] Some species may raid the nests of wasps and bees for the honey and immature insects, in spite of stinging from the adults.[77] Sun bears use their long tongues to lick up both insects and honey.[78] 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 burrowing mammals like rodents may be dug out and eaten.[79][67]
Polar bear feeding on a seal on an ice floe north of Svalbard
, Norway. It is the most carnivorous species.
The brown bear and both species of black bears sometimes take large ungulates, such as
bovids, mostly the young and weak.[66][80][79] These animals may be taken by a short rush and ambush, though hiding young may be stiffed out and pounced on.[67][81] The polar bear mainly preys on seals, stalking them from the ice or breaking into their dens. They primarily eat the highly digestible blubber.[82][79] Large mammalian prey is typically killed by a bite to the head or neck, or (in the case of young) simply pinned down and mauled.[67][83] Predatory behavior in bears is typically taught to the young by the mother.[79]
Bears are prolific
kleptoparasites, stealing food caches from rodents, and carcasses from other predators.[53][84] 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 (4–7 lb) of fat a day prior to entering its den.[85]
Bears produce a number of vocal and non-vocal sounds. Tongue-clicking, grunting or chuffing many be made in cordial situations, such as between mothers and cubs or courting couples, while moaning, huffing, snorting or blowing air is made when an individual is stressed. Barking is produced during times of alarm, excitement or to give away the animal's position. Warning sounds include jaw-clicking and lip-popping, while teeth-chatters, bellows, growls, roars and pulsing sounds are made in aggressive encounters. Cubs may squeal, bawl, bleat or scream when in distress and make motor-like humming when comfortable or nursing.[50][86][87][88][89][90]
Nagarhole Tiger Reserve
, India
Bears sometimes communicate with visual displays such as
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.[63][91]
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.[92] Pandas are known to mark objects with urine and a waxy substance from their anal glands.[93] Polar bears leave behind their scent in their tracks which allow individuals to keep track of one another in the vast Arctic wilderness.[94]
Reproduction and development
North American Bear Center
The mating system of bears has variously been described as a form of
serial monogamy.[95][96][97] 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 vocalizing. Ovulation is induced by mating, which can last up to 30 minutes depending on the species.[96]
estrus.[101] Cubs may flee and the mother defends them even at the cost of her life.[102][103][104]
In some species, offspring may become independent around the next spring, though some may stay until the female successfully mates again. 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.[98] Lifespan may also vary between species. The brown bear can live an average of 25 years.[105]
Bears of northern regions, including the American black bear and the grizzly bear, hibernate in the winter.[106][107] 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.[108] Bears normally do not wake during their hibernation, and can go the entire period without eating, drinking, urinating, or defecating.[45] A fecal plug is formed in the colon, and is expelled when the bear wakes in the spring.[109] If they have stored enough body fat, their muscles remain in good condition, and their protein maintenance requirements are met from recycling waste urea.[45] Female bears give birth during the hibernation period, and are roused when doing so.[107]
Mortality
Hunters with shot bear, Sweden, early 20th century. This photograph is in the Nordic Museum
.
Bears do not have many predators. The most important are humans, and as they started cultivating crops, they increasingly came in conflict with the bears that raided them. Since the invention of firearms, people have been able to kill bears with greater ease.
Felids like the tiger may also prey on bears,[111][112] particularly cubs, which may also be threatened by canids.[13][97]
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.[113] 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.[114] Bears in North America are sometimes infected by a Morbillivirus similar to the canine distemper virus.[115] They are susceptible to infectious canine hepatitis (CAV-1), with free-living black bears dying rapidly of encephalitis and hepatitis.[116]
In modern times, bears have come under pressure through encroachment on their habitats
least concern species, the brown bear and the American black bear,[119] are at risk of extirpation in certain areas. In general these two species inhabit remote areas with little interaction with humans, and the main non-natural causes of mortality are hunting, trapping, road-kill and depredation.[120]
Laws have been passed in many areas of the world to protect bears from
UNESCO World Heritage Site designation in 2006.[123] Where bears raid crops or attack livestock, they may come into conflict with humans.[124][125] 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.[124]
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.[126] Bears may attack humans in response to being startled, in defense of young or food, or even for predatory reasons.[127]
Entertainment, hunting, food and folk medicine
Bears in captivity have for centuries been used for entertainment. They have been trained to
dance,[128] and were kept for baiting in Europe from at least the 16th century. There were five bear-baiting gardens in Southwark, London, at that time; archaeological remains of three of these have survived.[129] Across Europe, nomadicRomani bear handlers called Ursari lived by busking with their bears from the 12th century.[130]
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.[131][132]
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.[133]
Bears have been popular subjects in art, literature, folklore and mythology. 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.
shaman; this may be based on the solitary nature of both. Bears have thus been thought to predict the future and shaman were believed to have been capable of transforming into bears.[136]
There is evidence of prehistoric
Siberian peoples[140] and more recently Koreans considered the bear as the spirit of their forefathers.[141]Artio (Dea Artio in the Gallo-Roman religion) was a Celtic bear goddess. Evidence of her worship has notably been found at Bern, itself named for the bear. Her name is derived from the Celtic word for "bear", artos.[142] In ancient Greece, the archaic cult of Artemis in bear form survived into Classical times at Brauron, where young Athenian girls passed an initiation rite as arktoi "she bears".[143]
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.[b][8] The nearby star Arcturus means "guardian of the bear", as if it were watching the two constellations.[145] 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.[146]
Bears are popular in children's stories, including
animated television shows and films.[153][154] The Care Bears began as greeting cards in 1982, and were featured as toys, on clothing and in film.[155] Around the world, many children—and some adults—have teddy bears, stuffed toys in the form of bears, named after the American statesman Theodore Roosevelt when in 1902 he had refused to shoot an American black bear tied to a tree.[156]
Bears, like other animals, may symbolize nations. The Russian Bear has been a common national personification for Russia from the 16th century onward.[157]Smokey Bear has become a part of American culture since his introduction in 1944, with his message "Only you can prevent forest fires".[158]
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.[159]
Specialty organizations for each of the eight species of bears worldwide include:
^"bear (n.)". Online Etymology Dictionary. Archived from the original on 2017-02-02. Retrieved 22 January 2017.
^Postma, Laura. "The word for "bear"". University of Pittsburgh Slovak Studies Program. Archived from the original on 2017-11-22. Retrieved 21 March 2018.
. They are opportunistic omnivores whose diet varies from plant foliage, roots, and fruits; insect adults, larvae, and eggs; animal matter from carrion; animal matter from predation; and fish. Their dentition and digestive system reflects this varied diet.
^Biel, M; Gunther, K. "Denning and Hibernation Behavior". Yellowstone National Park. National Park Service. Archived from the original on 2016-11-18. Retrieved 18 November 2016.
^Liddell, Henry George; Scott, Robert. "Ἀρκτοῦρος". A Greek-English Lexicon. Perseus. Archived from the original on 2017-03-07. Retrieved 23 January 2017.
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