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114-589: The sloth bear ( Melursus ursinus ), also known as the Indian bear , is a myrmecophagous bear species native to the Indian subcontinent . It feeds on fruits , ants and termites . It is listed as vulnerable on the IUCN Red List , mainly because of habitat loss and degradation . It is the only species in the genus Melursus . It has also been called "labiated bear" because of its long lower lip and palate used for sucking up insects. It has long, shaggy fur,

228-766: A bear weighing 120 pounds (54 kg) was observed turning flat rocks weighing 310 to 325 pounds (141 to 147 kg) by flipping them over with a single foreleg. They move in a rhythmic, sure-footed way and can run at speeds of 25 to 30 miles per hour (40 to 48 km/h). American black bears have good eyesight and have been proven experimentally to be able to learn visual color discrimination tasks faster than chimpanzees and just as fast as domestic dogs . They are also capable of rapidly learning to distinguish different shapes such as small triangles, circles and squares. Adults typically range from 120 to 200 cm (47 to 79 in) in head-and-body length, and 70 to 105 cm (28 to 41 in) in shoulder height. Although they are

342-468: A black bear with a longer, narrower skull shape (particularly the snout), loose-looking, flappier lips and paler muzzle colour. In few areas of overlap, sloth bear confusion with sun bears is unlikely, given the latter species considerably smaller size, much shorter fur, wrinkled folding skin (especially around the back), bolder chest marking and drastically different, more compact head structure and appearance. The sloth bear's global range includes India ,

456-531: A classification was hard to sustain, and there was a growing trend to see the features as examples of convergent evolution . For example, at the start of the 20th century Frank Evers Beddard , writing in The Cambridge Natural History, Vol 10, Mammalia , having discussed some discrepant features, said: "The fact is, that we have here a polymorphic order which contains in all probability representatives of at least two separate orders. We have at present

570-401: A common ancestor 5.05 million years ago (mya). American and Asian black bears are considered sister taxa and are more closely related to each other than to the other modern species of bears. According to recent studies, the sun bear is also a relatively recent split from this lineage. A small primitive bear called Ursus abstrusus is the oldest known North American fossil member of

684-619: A forest canopy of hardwoods such as beech , maple , birch and coniferous species. Corn crops and oak-hickory mast are also common sources of food in some sections of the northeast; small, thick swampy areas provide excellent refuge cover largely in stands of white cedar . Along the Pacific coast, redwood , Sitka spruce and hemlocks predominate as overstory cover. Within these northern forest types are early successional areas important for American black bears, such as fields of brush, wet and dry meadows , high tidelands , riparian areas and

798-427: A hairless web. They have the longest tail in the bear family, which can grow to 15–18 cm (6–7 in). Their back legs are not very strong, though they are knee-jointed, and allow them to assume almost any position. The ears are very large and floppy. The sloth bear is the only bear with long hair on its ears. Sloth bear fur is completely black (rusty for some specimens), save for a whitish Y- or V-shaped mark on

912-755: A mane around the face, and long, sickle-shaped claws. It is lankier than brown and Asian black bears . It shares features of insectivorous mammals and evolved during the Pleistocene from the ancestral brown bear through divergent evolution . Sloth bears breed during spring and early summer and give birth near the beginning of winter. When their territories are encroached upon by humans, they sometimes attack them. Historically, humans have drastically reduced these bears' habitat and diminished their population by hunting them for food and products such as their bacula and claws. Sloth bears have been tamed and used as performing animals and as pets. George Shaw in 1791 named

1026-460: A month after birth, become independent at 24–36 months, and become sexually mature at the age of three years. Young cubs ride on their mother's back when she walks, runs, or climbs trees until they reach a third of her size. Individual riding positions are maintained by cubs through fighting. Intervals between litters can last two to three years. Sloth bears are expert hunters of termites , ants , and bees , which they locate by smell. On arriving at

1140-407: A motor-like humming sound when comfortable or nursing. American black bears often mark trees using their teeth and claws as a form of communication with other bears, a behavior common to many species of bears. Sows usually produce their first litter at the age of 3 to 5 years, with those living in more developed areas tending to get pregnant at younger ages. The breeding period usually occurs in

1254-544: A mound, they scrape at the structure with their claws until they reach the large combs at the bottom of the galleries, and disperse the soil with violent puffs. The termites are then sucked up through the muzzle, producing a sucking sound which can be heard 180 m away. Their sense of smell is strong enough to detect grubs 3 ft below ground. Unlike other bears, they do not congregate in feeding groups. Sloth bears may supplement their diets with fruit, plant matter, carrion, and very rarely other mammals. In March and April, they eat

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1368-409: A physical attack almost immediately. When people living near an aggressive population of sloth bears were armed with rifles, it was found that it was an ineffective form of defense, since the bear apparently charges and knocks the victim back (often knocking the rifle away) before the human has the chance to defend themself. In Madhya Pradesh , sloth bear attacks accounted for the deaths of 48 people and

1482-1275: A reduced heart rate and basal metabolic rate. The metabolic rate of a hibernating bear will remain at a reduced level for up to 21 days after hibernation. After emerging from their winter dens in spring, they wander their home ranges for two weeks so that their metabolism accustoms itself to the activity. In mountainous areas, they seek southerly slopes at lower elevations for forage and move to northerly and easterly slopes at higher elevations as summer progresses. The time that American black bears emerge from hibernation varies. Factors affecting this include temperature, flooding, and hunger. In southern areas, they may wake up in midwinter. Further north, they may not be seen until late March, April, or even early May. Altitude also has an effect. Bears at lower altitudes tend to emerge earlier. Mature males tend to come out earliest, followed by immature males and females, and lastly mothers with cubs. Mothers with yearling cubs are seen before those with newborns. Generally, American black bears are largely crepuscular in foraging activity, though they may actively feed at any time. Up to 85% of their diet consists of vegetation, though they tend to dig less than brown bears, eating far fewer roots , bulbs , corms and tubers than

1596-510: A shot into the bear, and he left me. I felt the weight lift off me, and got up. I did not think I was much hurt. ... The main wound was a flap of flesh torn out of the inside of my left thigh and left hanging. It was fairly deep, and I could see all the muscles working underneath when I lifted it up to clean the wound." Myrmecophagous Myrmecophagy is found in several land-dwelling vertebrate taxa, including reptiles and amphibians ( horned lizards and blind snakes , narrow-mouthed toads of

1710-431: A single claw being interpreted as being used to break into colonial insect nests. Mammals that specialize in myrmecophagy often display similar adaptations for this niche. Many have powerful forelimbs and claws adapted to excavating the nests of ant or termite colonies from the earth or from wood or under bark. Most have reduced teeth and some have reduced jaws as well. Many have low basal body temperatures resulting from

1824-404: A slow, shambling motion, with their feet being set down in a noisy, flapping motion. They are capable of galloping faster than running humans. Although they appear slow and clumsy, both young and adult sloth bears are excellent climbers. They occasionally will climb to feed and to rest, though not to escape enemies, as they prefer to stand their ground. Sloth bear mothers carry their cubs up trees as

1938-502: A study of American black bears in Nevada found that the amount of annual mortality of a population of bears in wilderness areas was 0%, whereas in developed areas in the state this figure rose to 83%. Survival in subadults is generally less assured. In Alaska, only 14–17% of subadult males and 30–48% of subadult females were found in a study to survive to adulthood. Across the range, the estimated number of cubs who survive past their first year

2052-490: A three-quarters grown female sloth bear in an apparently lengthy fight that culminated in the trees. Apparently, a sloth bear killed a leopard in a confrontation in Yala National Park , Sri Lanka , but was itself badly injured in the fight and was subsequently put down by park rangers. Sloth bears occasionally chase leopards from their kills. Dhole packs may attack sloth bears. When attacking them, dholes try to prevent

2166-810: A variety of mast-producing hardwood species. The spruce-fir forest dominates much of the range of the American black bear in the Rockies . Important non-forested areas here are wet meadows, riparian areas, avalanche chutes, roadsides, burns, sidehill parks and subalpine ridgetops . In areas where human development is relatively low, such as stretches of Canada and Alaska, American black bears tend to be found more regularly in lowland regions. In parts of northeastern Canada, especially Labrador , American black bears have adapted exclusively to semi-open areas that are more typical habitat in North America for brown bears (likely due to

2280-563: A very few, and these perhaps highly modified, descendants of a large and diverse group of mammals." As genome sequences for various former members of Edentata have been published, all genetic evidence has confirmed that its members are taxonomically distant. Ants are dangerous, small, and rich in distasteful and harmful compounds, making them difficult prey and favouring ant mimicry for defence among invertebrates. Ants are plentiful, so members of several invertebrate taxa do feed on ants. Such ant predators include some spiders, such as species in

2394-419: Is 60%. With the exception of the rare confrontation with an adult brown bear or a gray wolf pack, adult black bears are not usually subject to natural predation. However, as evidenced by scats with fur inside of them and the recently discovered carcass of an adult sow with puncture marks in the skull, black bears may occasionally fall prey to jaguars in the southern parts of their range. In such scenarios,

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2508-617: Is fed to the cubs. This "bear's bread" is considered a delicacy by some of India's natives. Rarely, Sloth bears can become addicted to sweets in hotel waste, visiting rubbish bins, even inside populated towns, all year long. Their diet includes animal flesh. In Neyyar Wildlife Sanctuary, Kerala, seeds of six tree species eaten and excreted by sloth bears ( Artocarpus hirsuta , A. integrifolia , Cassia fistula , Mangifera indica , Zizyphus oenoplina ) did not see significantly different percentages of germination (appearance of cotyledon) when compared to germinated seeds that had not been passed through

2622-875: Is from 55 to 105 kg (121 to 231 lb), and for males is from 80 to 145 kg (176 to 320 lb). Exceptionally large female specimens can reach 124 kg (273 lb) and males up to 192 kg (423 lb). The average weight of sloth bears from the nominate subspecies in Nepal was 95 kg (209 lb) in females and 114 kg (251 lb) in males. Nominate bears in India were found to weigh average 93.2 kg (205 lb) in males and 83.3 kg (184 lb) in female per one study. Specimens from Sri Lanka ( M. u. inornatus ) may weigh up to 68.2 kg (150 lb) in females and 104.5 kg (230 lb) in males. However six Sri Lankan male sloth bears averaged only 74.8 kg (165 lb), and 57.5 kg (127 lb)

2736-859: Is made as a warning signal. Chuffing calls are made when disturbed. Females keep in contact with their cubs with a grunt-whicker while cubs yelp when separated. The breeding season for sloth bears varies according to location: in India, they mate in April, May, and June, and give birth in December and early January, while in Sri Lanka, it occurs all year. Sows gestate for 210 days, and typically give birth in caves or in shelters under boulders. Litters usually consist of one or two cubs, or rarely three. Cubs are born blind, and open their eyes after four weeks. Sloth bear cubs develop quickly compared to most other bear species: they start walking

2850-408: Is not uncommon to find sloth bear fur in tiger scats. Tigers typically hunt sloth bears by waiting for them near termite mounds, then creeping behind them and seizing them by the back of their necks and forcing them to the ground with their weight. One tiger was reported to simply break its victim's back with its paw, then wait for the paralysed bear to exhaust itself trying to escape before going in for

2964-735: Is record of a golden eagle snatching a yearling cub. Once out of hibernation, mother bears may be able to fight off most potential predators. Even cougars will be displaced by an angry mother bear if they are discovered stalking the cubs. Flooding of dens after birth may also occasionally kill newborn cubs. However, in current times, bear fatalities are mainly attributable to human activities. Seasonally, thousands of black bears are hunted legally across North America to control their numbers, while some are illegally poached or trapped unregulated. Auto collisions also may claim many black bears annually. American black bears were once not considered true or "deep" hibernators , but because of discoveries about

3078-679: Is restricted to the Terai . Sloth bears may have reached their current form in the Early Pleistocene , the time when the bear family specialised and dispersed. A fragment of fossilised humerus from the Pleistocene, found in Andhra Pradesh 's Kurnool Basin is identical to the humerus of a modern sloth bear. The fossilised skulls of a bear once named Melursus theobaldi found in the Shivaliks from

3192-503: Is stated that the bears had been seen in the zoological gardens to couple freely, but previously to 1848 most had rarely conceived. In the reports published since this date three species have produced young (hybrids in one case), ... A bear shot in autumn 1986 in Michigan was thought by some to be an American black bear/grizzly bear hybrid, because of its unusually large size and its proportionately larger brain case and skull. DNA testing

3306-583: Is still large. Many organisations are helping in the conservation and preservation of sloth bears in safe places. Sloth bears previously used for entertainment are being rehabilitated in facilities like Agra Bear Rescue Facility run by Wildlife SOS and others. Major sloth bear sanctuaries in India include the Daroji bear sanctuary, Karnataka. Sloth bears have also been found dead in traps, electrocuted, or killed by other means by poachers, with body parts (i.e. canines, claws, gall bladder, paws, etc) usually removed for

3420-467: Is the coccinellid Diomus ; larvae of Diomus thoracicus in French Guiana specialise in the nests of the invasive ant species Wasmannia auropunctata . One of the predominant predators on ants are other ants, especially the army ants and their close relatives. Some ants such as the raider ant Oocerea biroi and the new world army ant Nomamyrmex esenbecki are obligate myrmecophages, that

3534-442: Is they eat exclusively other ants, while other ants like the infamous swarm-raiding Eciton burchellii eat more or less all arthropods in their paths, including any ants they can get. Primarily it is the highly nutritious pupae and larvae, rather than the adult ants, that are taken and eaten. American black bear 16, see text Euarctos americanus The American black bear ( Ursus americanus ), also known as

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3648-591: The Driftless Area of southeastern Minnesota , northeastern Iowa , and southwestern Wisconsin are common. In 2019, biologists with the Iowa Department of Natural Resources confirmed documentation of an American black bear living year-round in woodlands near the town of Decorah in northeastern Iowa, believed to be the first instance of a resident black bear in Iowa since the 1880s. Surveys taken from 35 states in

3762-604: The Himalayan black bear subspecies of Asian black bear is nearly as dangerous. Sloth bears likely view humans as potential predators, as their reactions to them (roaring, followed by retreat or charging) are similar to those evoked in the presence of tigers and leopards. Their long claws, which are ideally adapted for digging at termite mounds, make adults less capable of climbing trees to escape danger, as are other bears such as Asian black bears. Therefore, sloth bears have seemingly evolved to deal with threats by behaving aggressively. For

3876-605: The Southeastern United States . American black bears in the southern Appalachian Mountains survive in predominantly oak-hickory and mixed mesophytic forests. In the coastal areas of the southeast (such as Florida , the Carolinas and Louisiana ), bears inhabit a mixture of flatwoods , bays and swampy hardwood sites. In the northeastern part of the range (the United States and Canada), prime habitat consists of

3990-602: The Terai of Nepal , temperate climatic zones of Bhutan and Sri Lanka . It occurs in a wide range of habitats including moist and dry tropical forests , savannahs , scrublands and grasslands below 1,500 m (4,900 ft) on the Indian subcontinent, and below 300 m (980 ft) in Sri Lanka's dry forests . It is regionally extinct in Bangladesh. Adult sloth bears may travel in pairs. Males are often observed to be gentle with cubs. They may fight for food. They walk in

4104-1057: The West Coast , although they typically follow Bergmann's rule , and bears from the northwest are often slightly heavier than the bears from the southeast. Adult males typically weigh between 57–250 kg (126–551 lb), while females weigh 33% less at 41–170 kg (90–375 lb). In California, studies indicate that the average mass is 86 kg (190 lb) in adult males and 58 kg (128 lb) in adult females. Adults in Yukon Flats National Wildlife Refuge in east-central Alaska were found to average 87.3 kg (192 lb) in males and 63.4 kg (140 lb) in females, whereas on Kuiu Island in southeastern Alaska (where nutritious salmon are readily available) adults averaged 115 kg (254 lb). In Great Smoky Mountains National Park , adult males averaged 112 kg (247 lb) and adult females averaged 47 kg (104 lb) per one study. In one of

4218-486: The black bear , is a species of medium-sized bear endemic to North America . It is the continent's smallest and most widely distributed bear species. It is an omnivore , with a diet varying greatly depending on season and location. It typically lives in largely forested areas but will leave forests in search of food and is sometimes attracted to human communities due to the immediate availability of food. The International Union for Conservation of Nature (IUCN) lists

4332-567: The sloth bear of Mysore , was responsible for the deaths of 12 people and the mutilation of 24 others. It was shot by Kenneth Anderson . Although sloth bears have attacked humans, they rarely become man-eaters . Dunbar-Brander's Wild Animals of Central India mentions a case in which a sow with two cubs began a six-week reign of terror in Chanda , a district of the Central Provinces , during which more than one of their victims had been eaten, while

4446-623: The American black bear as a least-concern species because of its widespread distribution and a large population, estimated to be twice that of all other bear species combined. Along with the brown bear ( Ursus arctos ), it is one of only two modern bear species not considered by the IUCN to be globally threatened with extinction. The American black bear is not closely related to the brown bear or polar bear , though all three species are found in North America ; genetic studies reveal that they split from

4560-532: The American black bears remained arboreal omnivores, like their Asian ancestors. The American black bear's generalist behavior allowed it to exploit a wider variety of foods and has been given as a reason why, of these three genera, it alone survived climate and vegetative changes through the last Ice Age while the other, more specialized North American predators became extinct. However, both Arctodus and Tremarctos had survived several other, previous ice ages . After these prehistoric ursids became extinct during

4674-594: The Asian black bear 4.08 mya. The earliest American black bear fossils, which were located in Port Kennedy, Pennsylvania , greatly resemble the Asian species, though later specimens grew to sizes comparable to grizzly bears . From the Holocene to the present, American black bears seem to have shrunk in size, but this has been disputed because of problems with dating these fossil specimens. The American black bear lived during

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4788-471: The Early Pleistocene or Early Pliocene are thought by certain authors to represent an intermediate stage between sloth bears and ancestral brown bears. M. theobaldi itself had teeth intermediate in size between sloth bears and other bear species, though its palate was the same size as the former species, leading to the theory that it is the sloth bear's direct ancestor. Sloth bears probably arose during

4902-519: The June–July period, though it can extend to August in the species' northern range. The breeding period lasts for two to three months. Both sexes are promiscuous. Males try to mate with several females, but large, dominant ones may violently claim a female if another mature male comes near. Copulation can last 20–30 minutes. Sows tend to be short-tempered with their mates after copulating. The fertilized eggs undergo delayed development and do not implant in

5016-1356: The Middle Pliocene and evolved in the Indian subcontinent. The sloth bear shows evidence of having undergone a convergent evolution similar to that of other ant-eating mammals. The sloth bear is one of eight extant species in the bear family Ursidae and of six extant species in the subfamily Ursinae . Giant panda ( Ailuropoda melanoleuca ) [REDACTED] Spectacled bear ( Tremarctos ornatus ) [REDACTED] Sloth bear ( Melursus ursinus ) [REDACTED] Sun bear ( Helarctos malayanus ) [REDACTED] Asian black bear ( Ursus thibetanus ) [REDACTED] American black bear ( Ursus americanus ) [REDACTED] Polar bear ( Ursus maritimus ) [REDACTED] Brown bear ( Ursus arctos ) [REDACTED] Giant panda ( Ailuropoda melanoleuca ) [REDACTED] Spectacled bear ( Tremarctos ornatus ) [REDACTED] Sloth bear ( Melursus ursinus ) [REDACTED] Sun bear ( Helarctos malayanus ) [REDACTED] Asian black bear ( Ursus thibetanus ) [REDACTED] American black bear ( Ursus americanus ) [REDACTED] Polar bear ( Ursus maritimus ) [REDACTED] Brown bear ( Ursus arctos ) [REDACTED] Sloth bears adults are medium-sized bears. The typical weight range for females

5130-594: The absence there of brown and polar bears, as well as other large carnivore species). The skulls of American black bears are broad, with narrow muzzles and large jaw hinges. In Virginia , the length of adult bear skulls was found to average 262 to 317 mm (10.3 to 12.5 in). Across its range, the greatest skull length for the species has been reportedly measured from 23.5 to 35 cm (9.3 to 13.8 in). Females tend to have slenderer and more pointed faces than males. Their claws are typically black or grayish-brown. The claws are short and rounded, being thick at

5244-605: The average of 65.2 kg (144 lb) in wild-land ones. In Waterton Lakes National Park , Alberta, adults averaged 125 to 128 kg (276 to 282 lb). The biggest wild American black bear ever recorded was a male from New Brunswick , shot in November 1972, that weighed 409 kg (902 lb) after it had been dressed, meaning it weighed an estimated 500 kg (1,100 lb) in life and measured 2.41 m (7 ft 11 in) long. Another notably outsized wild American black bear, weighing in at 408 kg (899 lb),

5358-436: The base and tapering to a point. Claws from both hind and front legs are almost identical in length, though the foreclaws tend to be more sharply curved. The paws of the species are relatively large, with a rear foot length of 13.7 to 22.5 cm (5.4 to 8.9 in), which is proportionately larger than other medium-sized bear species, but much smaller than the paws of large adult brown, and especially polar bears. The soles of

5472-610: The bear evolved alongside larger, more aggressive bear species, such as the extinct giant short-faced bear and the grizzly bear, that monopolized more open habitats and the historic presence of larger predators, such as Smilodon and the American lion , that could have preyed on black bears. Although found in the largest numbers in wild, undisturbed areas and rural regions, American black bears can adapt to surviving in some numbers in peri-urban regions, as long as they contain easily accessible foods and some vegetative coverage. In most of

5586-423: The bear from retreating into caves. Unlike tigers which prey on sloth bears of all size, there is little evidence that dholes are a threat to fully-grown sloth bears other than exceptionally rare cases. In one case, a golden jackal (a species much smaller and less powerful than a sloth bear and not generally a pack hunter as is the dhole) was seen to aggressively displace an adult bear which passively loped away from

5700-431: The bear's weight was on me, and he was biting my leg. He bit two or three times. I felt the flesh crush, but I felt no pain at all. It was rather like having a tooth out with gas. I felt no particular terror, though I thought the bear had got me; but in a hazy sort of way I wondered when he would kill me, and thought what a fool I was to get killed by a stupid beast like a bear. The shikari then very pluckily came up and fired

5814-400: The big cat would have the advantage if it ambushed the bear, killing it with a crushing bite to the back of the skull. Cubs tend to be more vulnerable to predation than adults, with known predators including bobcats , coyotes , cougars , gray wolves, brown bears and other bears of their own species. Many of these will stealthily snatch small cubs right from under the sleeping mother. There

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5928-488: The chest. This feature is sometimes absent, particularly in Sri Lankan specimens. This feature, which is also present in Asian black bears and sun bears , is thought to serve as a threat display, as all three species are sympatric with tigers (tigers usually do not carry out attacks on an adult bear if the bear is aware or facing the cat). The coat is long, shaggy, and unkempt, despite the relatively warm environment in which

6042-752: The coastal islands and the adjacent mainland of southwestern British Columbia. Albino individuals have also been recorded. Black coats tend to predominate in humid areas such as Maine, New England, New York, Tennessee, Michigan and western Washington. Approximately 70% of all American black bears are black, though only 50% in the Rocky Mountains are black. Many in northwestern North America are cinnamon, blonde or light brown in color and thus may sometimes be mistaken for grizzly bears. Grizzly (and other types of brown) bears can be distinguished by their shoulder hump, larger size and broader, more concave skull. In his book The Great Bear Almanac , Gary Brown summarized

6156-415: The colon known as a fecal plug . Leptin is released into the bear's systems to suppress appetite. The retention of waste during hibernation (specifically in minerals such as calcium ) may play a role in the bear's resistance to atrophy. The body temperature does not drop significantly, like other mammalian hibernators (staying around 35 °C (95 °F)) and they remain somewhat alert and active. If

6270-447: The conservation ethics, particularly among locals. To resolve this conflict, the basic issue of deteriorating habitat, which is the reason for the conflict between people and bears, improvements through government or community-based reforestation programmes, may be promoted. The population of sloth bears grows when they live in high-profile reserves that protect species, such as tigers and elephants. Directly managed reserves could conserve

6384-541: The contiguous United States, American black bears today are usually found in heavily vegetated mountainous areas, from 400 to 3,000 m (1,300 to 9,800 ft) in elevation. For American black bears living in the American Southwest and Mexico, habitat usually consists of stands of chaparral and pinyon juniper woods . In this region, bears occasionally move to more open areas to feed on prickly pear cactus . At least two distinct, prime habitat types are inhabited in

6498-521: The distribution of populations outside those areas has not been updated since 1959. Mexico is the only country where the species is classified as "endangered". Throughout their range, habitats preferred by American black bears have a few shared characteristics. They are often found in areas with relatively inaccessible terrain, thick understory vegetation and large quantities of edible material (especially masts ). The adaptation to woodlands and thick vegetation in this species may have originally been because

6612-516: The early 1990s indicated that American black bear populations were either stable or increasing, except in Idaho and New Mexico . The population in the United States was estimated to range between 339,000 and 465,000 in 2011, though this estimate does not include data from Alaska, Idaho , South Dakota , Texas or Wyoming , whose populations were not recorded in the survey. In California there were an estimated 25,000-35,000 black bears in 2017, making it

6726-672: The eight modern bear species are habitually arboreal (the most arboreal species, the American and Asian black bears and the sun bear, being fairly closely related). Their arboreal abilities tend to decline with age. They may be active at any time of the day or night, although they mainly forage by night. Bears living near human habitations tend to be more extensively nocturnal , while those living near brown bears tend to be more often diurnal . American black bears tend to be territorial and non- gregarious in nature. However, at abundant food sources (e.g. spawning salmon or garbage dumps), they may congregate and dominance hierarchies form, with

6840-404: The fallen petals of mowha trees and are partial to mangoes , maize , sugar cane , jackfruit , and the pods of the golden shower tree . Sloth bears are extremely fond of honey. When feeding their cubs, sows are reported to regurgitate a mixture of half-digested jack fruit, wood apples , and pieces of honeycomb . This sticky substance hardens into a dark yellow, circular, bread-like mass which

6954-608: The family Microhylidae and poison frogs of the Dendrobatidae ), a number of New World bird species ( Antbirds , Antthrushes , Antpittas , flicker of genus Colaptes ), and multiple mammalian groups including anteaters , aardvarks , aardwolves , armadillos , echidnas , numbats , pangolins , and sloth bears . The extinct alvarezsaurids , a group of theropod dinosaurs from the Cretaceous period, have been interpreted as myrmecophagous, with their short, robustly built arms with

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7068-475: The family Reduviidae feed largely or exclusively on ants. Examples include the genera Paredocla and Acanthaspis . Some insects that feed on ants do so because they are opportunistic predators of small insects that run on the ground surface, of which ants are a large proportion. Remarkable examples of convergent evolution are certain species of the Neuropteran family Myrmeleontidae , largely Myrmeleon ,

7182-598: The family Salticidae (jumping spiders), spiders in the family Oecobiidae and the family Theridiidae. While exclusive myrmecophagy is not very common, there are some striking examples, such as the Australian ant-slayer spider Euryopis umbilicata that feeds almost exclusively on one species of ant. Other examples include some myrmecomorphs ( ant mimics ) and myrmecophiles . Myrmecomorphs are Batesian mimics , giving them protection against predators which avoid ants, and access to abundant food. Various Hemipteran bugs, in

7296-445: The feet are black or brownish and are naked, leathery and deeply wrinkled. The hind legs are relatively longer than those of Asian black bears. The typically small tail is 7.7–17.7 cm (3.0–7.0 in) long. The ears are small and rounded and are set well back on the head. American black bears are highly dexterous , being capable of opening screw-top jars and manipulating door latches. They also have great physical strength;

7410-865: The female's womb until November. The gestation period lasts 235 days, and litters are usually born in late January to early February. Litter size is between one and six cubs, typically two or three. At birth, cubs weigh 280–450 g (0.62–0.99 lb) and measure 20.5 cm (8.1 in) in length. They are born with fine, gray, down-like hair and their hind quarters are underdeveloped. They typically open their eyes after 28–40 days and begin walking after 5 weeks. Cubs are dependent on their mother's milk for 30 weeks and will reach independence at 16–18 months. At 6 weeks, they attain 900 g (2.0 lb), by 8 weeks they reach 2.5 kg (5.5 lb) and by 6 months they weigh 18 to 27 kg (40 to 60 lb). They reach sexual maturity at 3 years and attain their full growth at 5 years. The average lifespan in

7524-453: The genus Ursus , dated to 4.95 mya. This suggests that U. abstrusus may be the direct ancestor of the American black bear, which evolved in North America. Although Wolverton and Lyman still consider U. vitabilis an "apparent precursor to modern black bears", it has also been placed within U. americanus . The ancestors of American black bears and Asian black bears diverged from sun bears 4.58 mya. The American black bear then split from

7638-401: The gut of the bears. However, seeds germinated much faster after being ingested by bears for three species, Artocarpus hirsuta, Cassia fistula, and Zizyphus oenoplina . This experiment suggests that sloth bears may play an important role in seed dispersal and germination, with effects varying by tree species. The large canine teeth of sloth bears, relative to both its overall body size and to

7752-415: The illegal wildlife trade. Sloth bears are one of the most aggressive extant bears and, due to large human populations often closely surrounding reserves that hold bears, aggressive encounters and attacks are relatively frequent, though in some places, attacks appear to be a reaction to encountering people accidentally. In absolute numbers, this is the species of bear that most regularly attacks humans. Only

7866-493: The injuring of 686 others between 1989 and 1994, probably due in part to the density of population and competition for food sources. A total of 137 attacks (resulting in 11 deaths) occurred between April 1998 and December 2000 in the North Bilaspur Forest Division of Chhattisgarh . The majority of attacks were perpetrated by single bears, and occurred in kitchen gardens, crop fields, and in adjoining forests during

7980-466: The kill. When confronted by tigers face to face, sloth bears charge at them, crying loudly. A young or already sated tiger usually retreats from an assertive sloth bear, as the bear's claws can inflict serious wounds, and most tigers end the hunt if the bears become aware of the tiger's presence before the pounce. Sloth bears may scavenge on tiger kills. As tigers are known to mimic the calls of sambar deer to attract them, sloth bears react fearfully even to

8094-495: The lack of a white blaze on the chest and hairier footpads. Despite their name, black bears show a great deal of color variation. Individual coat colors can range from white, blonde, cinnamon, light brown or dark chocolate brown to jet black, with many intermediate variations existing. Silvery-gray American black bears with a blue luster (this is found mostly on the flanks) occur along a portion of coastal Alaska and British Columbia. White to cream-colored American black bears occur in

8208-611: The largest population of the species in any of the 48 contiguous United States . In 2020 there were about 1,500 bears in Great Smoky Mountains National Park , where the population density is about two per square mile. In western North Carolina , the black bear population has dramatically increased in recent decades, from about 3,000 in the early 2000s to over 8,000 in the 2020s. As of 1993, known black bear populations in Mexico existed in four areas, though knowledge on

8322-521: The largest studies on regional body mass, bears in British Columbia averaged 73.7 kg (162 lb) in 89 females and 103.1 kg (227 lb) in 243 males. In Yellowstone National Park , a study found that adult males averaged 119 kg (262 lb) and adult females averaged 67 kg (148 lb). Black bears in north-central Minnesota averaged 70 kg (150 lb) in 163 females and 125 kg (276 lb) in 77 males. In New York,

8436-789: The largest, most powerful males dominating the most fruitful feeding spots. They mark their territories by rubbing their bodies against trees and clawing at the bark. Annual ranges held by mature male bears tend to be very large, though there is some variation. On Long Island off the coast of Washington, ranges average 5 sq mi (13 km ), whereas on the Ungava Peninsula in Canada ranges can average up to 1,000 sq mi (2,600 km ), with some male bears traveling as far as 4,349 sq mi (11,260 km ) at times of food shortages. Bears may communicate with various vocal and non-vocal sounds. Tongue-clicking and grunting are

8550-813: The last decade. The current range in the United States is constant throughout most of the Northeast and within the Appalachian Mountains almost continuously from Maine to northern Georgia , the northern Midwest , the Rocky Mountain region , the West Coast and Alaska . However, it becomes increasingly fragmented or absent in other regions. Despite this, American black bears in those areas seem to have expanded their range in recent decades, such as with recent sightings in Ohio , Illinois , southern Indiana , and western Nebraska. Sightings of itinerant black bears in

8664-522: The last glacial period 10,000 years ago, American black bears were probably the only bear present in much of North America until the migration of brown bears to the rest of the continent. American black bears are reproductively compatible with several other bear species and occasionally produce hybrid offspring. According to Jack Hanna 's Monkeys on the Interstate , a bear captured in Sanford, Florida ,

8778-446: The later instars of caterpillars of many butterflies in the family Lycaenidae enter the nests of particular species of ants and eat the ants' eggs and larvae. Larvae of some species of flies, such as the genus Microdon in the family Syrphidae spend their entire immature lives in the nests of ants, feeding largely or entirely on the ant brood. Some beetles specialise in feeding on the brood of particular species of ants. An example

8892-471: The latter species. When initially emerging from hibernation, they will seek to feed on carrion from winter-killed animals and newborn ungulates . As the spring temperature warms, American black bears seek new shoots of many plant species, especially new grasses , wetland plants and forbs . Young shoots and buds from trees and shrubs during the spring period are important to bears emerging from hibernation, as they assist in rebuilding muscle and strengthening

9006-452: The low caloric content of ants and termites, and most have advanced olfaction to help them find prey. Practically all have long, sticky tongues. In the nineteenth and early twentieth century many zoologists saw these shared features as evidence of relatedness, and accordingly they regarded the various species as a single order of Mammalia , the Edentata . It quite early became clear that such

9120-548: The males average 136 kg (300 lb) and females 72.6 kg (160 lb). It was found in Nevada and the Lake Tahoe region that bears closer to urban regions were significantly heavier than their arid-country dwelling counterparts, with males near urban areas averaging 138 kg (304 lb) against wild-land males which averaged 115.5 kg (255 lb) whereas peri-urban females averaged 97.9 kg (216 lb) against

9234-461: The metabolic changes that allow black bears to remain dormant for months without eating, drinking, urinating or defecating, most biologists have redefined mammalian hibernation as "specialized, seasonal reduction in metabolism concurrent with scarce food and cold weather". American black bears are now considered highly efficient hibernators. The physiology of American black bears in the wild is closely related to that of bears in captivity. Understanding

9348-403: The metabolic rate can drop to a quarter of the bear's (nonhibernating) basal metabolic rate . These reductions in metabolic rate and heart rate do not appear to decrease the bear's ability to heal injuries during hibernation. Their circadian rhythm stays intact during hibernation. This allows the bear to sense the changes in the day based on the ambient temperature caused by the sun's position in

9462-448: The monsoon season. One Mr. Watts Jones wrote a first-hand account of how it feels to be attacked by a sloth bear, recalling when he failed to score a direct hit against a bear he had targeted: I do not know exactly what happened next, neither does my hunter who was with me; but I believe, from the marks in the snow, that in his rush the bear knocked me over backwards in fact, knocked me three or four feet away. When next I remember anything,

9576-434: The most common sounds and are made in cordial situations to conspecifics, offspring and occasionally humans. When at ease, they produce a loud rumbling hum. During times of fear or nervousness, bears may moan, huff or blow air. Warning sounds include jaw-clicking and lip-popping. In aggressive interactions, black bears produce guttural pulsing calls that may sound like growling. Cubs squeal, bawl or scream when anxious and make

9690-415: The muscular strength compared to that of a well-nourished, inactive human. The bear's bone mass does not change in geometry or mineral composition during hibernation, which implies that the bear's conservation of bone mass during hibernation is caused by a biological mechanism. During hibernation American black bears retain all excretory waste, leading to the development of a hardened mass of fecal material in

9804-599: The outer edge of their noses, and they lack upper incisors, thus allowing them to suck up large numbers of insects. The premolars and molars are smaller than in other bears, as they do not chew as much vegetation. In adults, the teeth are usually in poor condition, due to the amount of soil they suck up and chew when feeding on insects. The back of the palate is long and broad, as is typical in other ant-eating mammals. The paws are disproportionately large, and have highly developed, sickle-shaped, blunt claws which measure 10 cm (4 in) in length. Their toe pads are connected by

9918-470: The physiology of bears in the wild is vital to the bear's success in captivity. The bears enter their dens in October and November, although in the southernmost areas of their range (i.e. Florida, Mexico, the southeastern United States ), only pregnant females and mothers with yearling cubs will enter hibernation. Prior to that time, they can put on up to 14 kg (30 lb) of body fat to get them through

10032-408: The predominance of black or brown/blonde specimens by location: American black bears have eyesight and hearing comparable to that of humans. Their keenest sense is smell, which is about seven times more sensitive than a domestic dog's. They are excellent and strong swimmers, swimming for pleasure and to feed (largely on fish). They regularly climb trees to feed, escape enemies and hibernate. Four of

10146-857: The primary defense against attacks by predators instead of sending them up trees. The cubs can be threatened by predators such as tigers, leopards, and other bears. They are adequate climbers on more accessible trees but cannot climb as quickly or on as varied surfaces as can black bears due to the sloth species' more elongated claw structure. Given their smaller size and still shorter claws, sloth bear cubs probably climb more proficiently than adults (much as brown bear cubs can climb well but not adults). They are good swimmers, and primarily enter water to play. To mark their territories, sloth bears scrape trees with their forepaws, and rub against them with their flanks. Sloth bears are recorded to produce several sounds and vocals. Howls, squeals, screams, barks and trumpet-like calls are made during aggressive encounters while huffing

10260-514: The same period as the giant and lesser short-faced bears ( Arctodus simus and A. pristinus , respectively) and the Florida spectacled bear ( Tremarctos floridanus ). These tremarctine bears evolved from bears that had emigrated from Asia to the Americas 7–8 mya. The giant and lesser short-faced bears are thought to have been heavily carnivorous and the Florida spectacled bear more herbivorous, while

10374-428: The same reason, brown bears can be similarly inclined, accounting for the relatively high incidence of seemingly nonpredatory aggression towards humans in these two bear species. According to Robert Armitage Sterndale , in his Mammalia of India (1884, p. 62): [The sloth bear] is also more inclined to attack man unprovoked than almost any other animal, and casualties inflicted by it are unfortunately very common,

10488-497: The several months during which they fast. Hibernation typically lasts 3–8 months, depending on regional climate. Hibernating bears spend their time in hollowed-out dens in tree cavities, under logs or rocks, in banks, caves, or culverts, and in shallow depressions. Although naturally-made dens are occasionally used, most dens are dug out by the bear. During their time in hibernation, an American black bear's heart rate drops from 40 to 50 beats per minute to 8 beats per minute, and

10602-428: The size of the canine teeth of other bear species, and the aggressive disposition of sloth bears, may be a defense in interactions with large, dangerous animals, such as the tiger , elephant , and rhinoceros , as well as prehistoric species such as Megantereon . Bengal tigers occasionally prey on sloth bears. Tigers usually give sloth bears a wide berth, though some specimens may become habitual bear killers, and it

10716-486: The skeleton and are often the only digestible foods available at that time. During summer, the diet largely comprises fruits, especially berries and soft masts such as buds and drupes . During the autumn hyperphagia , feeding becomes virtually the full-time task. Hard masts become the most important part of the diet in autumn and may even partially dictate the species' distribution. Favored masts such as hazelnuts , oak acorns and whitebark pine nuts may be consumed by

10830-592: The sky. It has also been shown that ambient light exposure and low disturbance levels (that is to say, wild bears in ambient light conditions) directly correlate with their activity levels. The bear keeping track of the changing days allows it to awaken from hibernation at the appropriate time of year to conserve as much energy as possible. The hibernating bear does not display the same rate of muscle and bone atrophy relative to other nonhibernatory animals that are subject to long periods of inactivity due to ailment or old age. A hibernating bear only loses approximately half

10944-445: The sloth bear of Mysore partially ate at least three of its victims. R.G. Burton deduced from comparing statistics that sloth bears killed more people than Asian black bears, and Theodore Roosevelt considered them to be more dangerous than American black bears . Unlike some other bear species, which at times make mock charges at humans when surprised or frightened without making physical contact, sloth bears frequently appear to initiate

11058-475: The sloth bear, hence such reserves must be supported. Managing garbage, especially hotel waste with foods, is essential in situations where sloth bears get used to entering towns with an increase in the number of accidental attacks on humans. The government of India has banned use of sloth bears for entertainment, and a 'Sloth Bear Welfare Project' in the country has the objective of putting an end to their use for entertainment. However, their number in such activity

11172-487: The smallest bear species in North America , large males exceed the size of other bear species, except the brown bear and the polar bear. Weight tends to vary according to age, sex, health and season. Seasonal variation in weight is very pronounced: in autumn, their pre-den weight tends to be 30% higher than in spring, when black bears emerge from their dens. Bears on the East Coast tend to be heavier on average than those on

11286-630: The snapping canid, indicating the sloth bear does not regard other carnivores as competition. Sloth bears are sympatric with Asiatic black bears in northern India, and the two species, along with the sun bear , coexist in some of the national parks and wildlife sanctuaries. They are also found together in Assam, Manipur, and Mizoram, in the hills south of the Brahmaputra River , the only places occupied by all three bear species. The three species do not act aggressively toward each other. This may be because

11400-512: The so-called ant lions, and the Dipteran family Vermileonidae , in particular the genera Lampromyia and Vermileo , the so-called worm lions. Both of them are regarded with interest for their habit of constructing conical pit traps in fine sand or dust, at the bottom of which they await prey that has fallen in. Both throw sand to interfere with any attempts on the part of the prey to escape. Myrmecophagy takes more forms than just eating adult ants;

11514-448: The sounds made by deer themselves. In 2011, a female bear with cubs was observed to stand her ground and prevail in a confrontation against two tigers (one female, one male) in rapid succession. Besides tigers there are few predators of sloth bears. Leopards can also be a threat, as they are able to follow sloth bears up trees. Bear cubs are probably far more vulnerable and healthy adult bears may be avoided by leopards. One leopard killed

11628-618: The southern farmlands of Alberta , Saskatchewan and Manitoba ; they have been extirpated on Prince Edward Island since 1937. Surveys taken in the mid-1990s found the Canadian black bear population to be between 396,000 and 476,000 in seven provinces; this estimate excludes populations in New Brunswick , the Northwest Territories , Nova Scotia and Saskatchewan . All provinces indicated stable populations of American black bears over

11742-474: The species Bradypus ursinus . In 1793, Meyer named it Melursus lybius , and in 1817, de Blainville named it Ursus labiatus because of its long lips. Illiger named it Prochilus hirsutus , the Greek genus name indicating long lips, while the specific name noted its long and coarse hair. Fischer called it Chondrorhynchus hirsutus , while Tiedemann named it Ursus longirostris . [REDACTED] In Nepal , it

11856-428: The species is found, and is particularly heavy behind the neck and between the shoulders, forming a mane which can be 30 cm (12 in) long. The belly and underlegs can be almost bare. Sloth bears are usually about the same size as an Asian black bear but are immediately distinctive for their shaggier coat, whitish claws, as well as their typically rangier build. Their head and mouth is highly distinct from that of

11970-439: The three species generally differ in habit and dietary preferences. Asian elephants apparently do not tolerate sloth bears in their vicinity. The reason for this is unknown, as individual elephants known to maintain their composure near tigers have been reported to charge bears. The Indian rhinoceros has a similar intolerance for sloth bears, and will charge at them. IUCN estimates that fewer than 20,000 sloth bears survive in

12084-468: The victim being often terribly disfigured even if not killed, as the bear strikes at the head and face. [William Thomas] Blanford was inclined to consider bears more dangerous than tigers... Captain Williamson in his Oriental Field Sports wrote of how sloth bears rarely killed their human victims outright, but would suck and chew on their limbs till they were reduced to bloody pulps. One specimen, known as

12198-489: The wild is 18 years, though it is quite possible for wild individuals to survive for more than 23 years. The record age of a wild individual was 39 years, while that in captivity was 44 years. The average annual survival rate is variable, ranging from 86% in Florida to 73% in Virginia and North Carolina. In Minnesota, 99% of wintering adult bears were able to survive the hibernation cycle in one study. Remarkably,

12312-730: The wilds of the Indian subcontinent and Sri Lanka. The sloth bear is listed in Schedule I of the Indian Wildlife Protection Act, 1972 , which provides for their legal protection. Commercial international trade of the sloth bear (including parts and derivatives) is prohibited as it is listed in Appendix I of the Convention on International Trade in Endangered Species . To address the human-bear conflict, people may be educated about

12426-507: The winter is mild enough, they may wake up and forage for food. Females also give birth in February and nurture their cubs until the snow melts. During winter, American black bears consume 25–40% of their body weight. The footpads peel off while they sleep, making room for new tissue. Many of the physiological changes an American black bear exhibits during hibernation are retained slightly post-hibernation. Upon exiting hibernation, bears retain

12540-445: The world's largest captive male and female American black bears. Ted, the male, weighed 431–453.5 kg (950–1,000 lb) in the fall of 2006. Honey, the female, weighed 219.6 kg (484 lb) in the fall of 2007. The fur is soft, with dense underfur and long, coarse, thick guard hairs. The fur is not as shaggy or coarse as that of brown bears. American black bear skins can be distinguished from those of Asian black bears by

12654-605: Was the average for four females, so Sri Lankan bears could be around 30% lighter in body mass than nominate race bears and with more pronounced size sexual dimorphism. They are 60–92 cm (2 ft 0 in – 3 ft 0 in) high at the shoulder, and have a body length of 1.4–1.9 m (4 ft 7 in – 6 ft 3 in). Besides being smaller than males, females reportedly typically have more fur between their shoulders. Sloth bear muzzles are thick and long, with small jaws and bulbous snouts with wide nostrils. They have long lower lips which can be stretched over

12768-677: Was the cattle-killer shot in December 1921 on the Moqui Reservation in Arizona . The record-sized American black bear from New Jersey was shot in Morris County December 2011 and scaled 376.5 kg (830 lb). The Pennsylvania state record weighed 399 kg (880 lb) and was shot in November 2010 in Pike County . The North American Bear Center, located in Ely, Minnesota , is home to

12882-478: Was thought to have been the offspring of an escaped female Asian black bear and a male American black bear. In 1859, an American black bear and a Eurasian brown bear were bred together in the London Zoological Gardens , but the three cubs that were born died before they reached maturity. In The Variation of Animals and Plants Under Domestication , Charles Darwin noted: In the nine-year Report it

12996-601: Was unable to determine whether it was a large American black bear or a grizzly bear. Sixteen subspecies are traditionally recognized; however, a recent genetic study does not support designating some of these, such as the Florida black bear, as distinct subspecies. Listed alphabetically according to subspecific name: Historically, American black bears occupied the majority of North America's forested regions. Today, they are primarily limited to sparsely settled, forested areas. American black bears currently inhabit much of their original Canadian range, though they seldom occur in

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