Asian black bear

Name and taxonomy

The species name thibetanus is probably a Latin form of Tibet, one of the regions where the bear lives. Older books call it Selenarctos thibetanus, and some authors placed it in the subgenus Euarctos. English names include Asiatic black bear, moon bear, white-chested bear and Himalayan black bear. In Thai the bear is mi khwai, the buffalo bear, because the pale mark under its neck resembles the mark on a buffalo. It belongs to the family Ursidae in the order Carnivora, with the brown bear, the polar bear and the giant panda.

Several subspecies live across the range. The Formosan black bear, U. t. formosanus, lives only in the central mountains of Taiwan. China holds three subspecies, and U. t. ussuricus is the only bear subspecies in the northeast of the country. The Baluchistan black bear of Pakistan and Iran is listed as Critically Endangered on its own. Two more subspecies lived in Europe and West Asia until the Late Pleistocene.

Evolution and relatives

The Asian black bear carries 74 chromosomes, almost the same set as the other five ursine bears. Scientists treat it as the least changed of the Old World bears. It may descend from Ursus minimus, an extinct bear that appeared about 4 million years ago. Bones of Ursus minimus are hard to tell from those of the living species, except by their age. The closest living relative is the American black bear. The two lines separated about 3 million years ago, though the genetic evidence is still thin.

The oldest fossils of the species come from Moldova, in the early Pliocene. Japanese bears may have split from mainland bears about 500,000 years ago, when bears crossed a land bridge from Korea. In zoos the species has bred with the American black bear, the sloth bear, the spectacled bear and the brown bear. Its body shows the first steps toward the tree-climbing build of the sun bear and the sloth bear.

Appearance

The coat is black, long and coarse. A pale V or crescent marks the chest, and a smaller pale band crosses the throat. The muzzle is light brown, and a white spot sits on the chin. The ears are large and bell shaped, and they stand out sideways from the head. For its size, the bear has longer ears than any other bear.

Adults stand 70 to 100 centimetres at the shoulder. Head and body measure 120 to 180 cm, and the tail adds only 6.5 to 10.6 cm. Males weigh about 110 to 150 kilograms, and females about 65 to 90 kg. The heaviest wild male on record reportedly reached 200 kg, and zoo animals have reached 225 kg.

The bear has a strong upper body for climbing and short, rather weak hind legs. The front claws are 30 to 45 millimetres long, longer than the hind claws, and they curve more than an American black bear's claws. It stands on two legs more readily than any other bear, and it can walk upright for over 400 metres. The skull is small but heavy, with a low crest on top. The lips and nose are large and mobile, more so than in the brown bear.

Habitat and range

The species lives across a broad but broken band of Asia. It occurs from southeastern Iran through Afghanistan and Pakistan, then along the Himalayan foothills of India, Nepal and Bhutan. It continues into Myanmar and mainland Southeast Asia, but it does not reach Malaysia. In China it lives in patches in the northeast and the south, including Hainan. Other groups survive in Taiwan, the Russian Far East, North Korea, and on Honshu and Shikoku in Japan.

It favours deciduous, mixed and thorn forests, and it needs thick cover. ADW describes moist forest on steep mountain slopes as its usual home. In the Himalayas it summers at about 3,500 metres and seldom goes above 3,700 m. In winter it drops below 1,500 m, and in Japan it also lives at sea level. Bears move to lower slopes each autumn to reach the nut crop.

During the Pleistocene the species ranged as far west as Spain and the Balkans. In South Korea it died out in the wild by the 1990s. A reintroduction at Jirisan National Park began in 2004, and by 2018 the park held 56 wild bears. GBIF holds records from 29 countries, but that count includes zoos and escaped animals.

Diet and feeding

The Asian black bear is an omnivore that eats mostly plants. Its food includes acorns, pine nuts, hazelnuts, cherries, grapes, other fruit, shoots, roots, bark, grasses and mushrooms. It also takes insects, beetle larvae, termites, bees, honey, eggs, carrion and rubbish near villages. In Japan, nuts from oaks and their relatives make up the largest share of the autumn diet. The bear gorges on these rich foods and stores the surplus as fat before winter.

The menu shifts with the season. In April and May it digs up the previous year's acorns and pine nuts. From mid-May to June it turns to green plants and early fruit. From July to September it climbs for cherries, pine cones, vines and grapes. It snaps branches under itself as it feeds, and this leaves nest-like platforms in the treetops.

The species eats more meat than the American black bear, though less than the brown bear. It kills wild boar, muntjac, serow, takin and even adult water buffalo, and it breaks the neck of its prey. It takes livestock when wild food fails, and it steals kills from tigers. Its nose can find grubs about 1 metre under the soil.

Behaviour and social life

The bear is active by day over most of its range, but it turns nocturnal near people. ADW reports the opposite pattern in some areas, with feeding at night and rest in a tree hole or cave by day. Night activity rises in autumn, when the bears must eat hard before winter. Adults forage alone, except for mothers with cubs and pairs in the mating season. When a family walks together, the bears go in a line from the largest to the smallest.

It climbs to feed, to rest, to sun itself, to escape enemies and even to den. In the Russian Far East, bears pass up to 15% of their hours in trees. It rests in tree nests, and it swims well. With enough food, a bear may stay in an area of only 1 to 2 square kilometres. ADW gives home ranges from about 6.4 to 36.5 square kilometres, depending on food.

Bears in the cold north hibernate, but bears in the south usually stay active. Almost every pregnant female dens for the winter. Dens are hollow trees, caves, holes in the ground or hollow logs, and the bear prepares them in mid-October. The sleep runs from November to March. During the sleep the heart rate falls from 40 to 70 beats a minute to 8 to 12. Body temperature drops by only 3 to 7 degrees, so the bear wakes easily.

Communication and senses

Asian black bears make many sounds. They grunt, whine and roar, and they slurp while they feed. A loud hiss is a warning, and a scream means a fight. When one bear approaches another, it makes a tut-tut sound with its tongue against the roof of its mouth. Courting bears cluck. Like other bears, a cub separated from its mother probably cries, and clicking teeth signal aggression.

The sense of smell is acute, and it guides the bear to buried insects and to the scent of other bears. Like other bears, it probably marks its range by rubbing on trees, urinating and defecating. Wikipedia reports poor eyesight and moderate hearing, with an upper limit of 30 kilohertz. ADW disagrees, and it calls the sight, hearing and smell all exceptional. Hunters in Kashmir found the black bear harder to stalk than the brown bear, because it saw and heard them sooner.

Reproduction and life cycle

Mating happens from June to October, depending on the population. In the Russian Far East it runs from mid-June to mid-August, and in Pakistan it happens in October. In captivity the mating system is promiscuous, and only the larger, older males mate. A male under 80 kilograms has little chance with a female. Females first breed at 3 to 4 years old.

Like other bears, the species probably delays implantation of the embryo by about two months. Wikipedia gives a gestation of 200 to 240 days, and ADW gives 7 to 8 months. The birth takes place in a winter den, usually in January or February. A litter holds 1 to 4 cubs, most often 2. A newborn weighs under half a kilogram. Cubs walk at about 4 days old and open their eyes about 3 days later.

Growth is slow, and a cub weighs only about 2.5 kilograms by May. Cubs nurse for a long time, and they leave the mother at 24 to 36 months. The mother then waits 2 to 3 years before the next litter. A wild bear can live up to 25 years. AnAge records a captive bear that lived 39.2 years, and Wikipedia reports one that reached 44.

Predators and threats

The tiger is the main predator of the Asian black bear. Russian hunters have found bear remains in tiger droppings. Tigers mostly take young bears, and a bear over 5 years old is usually safe. A chased bear runs up a tree and waits, but some tigers pretend to walk away and wait below. Leopards take cubs under 2 years old, and wolves and lynx may take cubs as well.

Brown bears sometimes attack the species in the Russian Far East. In the Himalayas the black bear tends to intimidate the brown bear, which is too heavy to climb for fruit. Jim Corbett watched a large black bear drive off a tiger even after the tiger tore its face. He also saw black bears carry off tiger kills twice.

People are the greater threat. Poachers take gall bladders, paws, skin and live cubs. Logging removes the hollow trees the bears den in, and it forces them onto the ground where tigers and hunters find them. Steel traps set for wild boar catch bears in Taiwan. In southern Iran, warming and habitat loss have cut the population by 30 to 40% in three decades.

Population and conservation

The IUCN lists the Asian black bear as Vulnerable, and CITES puts it in Appendix I. No reliable count exists for the whole species. Russian biologists once suggested only a few thousand across the range, but the basis is unclear. India may hold up to 9,000 bears, and Pakistan about 1,000. A Chinese government estimate gives 28,000, and Taiwan holds 200 to 600. Japan is the exception: its population rose from about 15,000 in 2012 to about 44,000 in 2023.

Protection is uneven. China protects the bear under its national wildlife law. India lists it in Schedule I of its Wildlife Protection Act, but poaching cases rarely reach a court. Russia lists it in its Red Data Book, yet 75 to 100 bears are shot legally each year and about 500 illegally. Vietnam banned hunting and export in 1989. South Korea reintroduced bears to Jirisan in 2004, and the park reached its carrying capacity by 2021.

South Korea still allows bear bile farms, which held about 1,374 bears on 74 farms in 2009. Japan set a bear management manual in 2000 with a cap on the annual cull. After the population boom and a rise in attacks, the Japanese government revised the plan in 2024 toward more hunting.

Relationship with humans

The species is more aggressive toward people than the brown bear of Eurasia or the American black bear. David Macdonald suggests this comes from a long history of living beside tigers. Most attacks happen when a person surprises a bear at close range in thick cover, or when a bear guards food. An attacking bear rears up, knocks the person down with its paws, then bites an arm or a leg and the head. Around 1900 a hospital in Srinagar treated dozens of bear victims every year.

Japan recorded nine deaths between 1979 and 1989. In 2016 four people died in Akita while they picked bamboo shoots. Injuries and deaths rose sharply around 2023 and hit a record in 2025, after poor nut crops sent bears into towns. Russia has no record of a bear eating a person, and Taiwan has no recorded conflict.

Bears strip bark from cedar and cypress, raid orchards and beehives, and eat rice, corn and persimmons. Japanese bears damage about 3,000 beehives a year. Bile, gall bladders, paws and bone glue sell in the traditional medicine trade. The species learns quickly and tames easily, and it was once common in circus acts. In Pakistan, cubs were taken for street dancing and bear baiting.

In culture and myth

In upland Japan the bear belongs to yama no kami, the mountain deity, and people call it the mountain man or the mountain uncle. A tale from Niigata says the deity gave the bear a silk-wrapped amulet, and the white mark is where the amulet hung. Matagi hunters in Akita treat an all-black bear as sacred, and a hunter who shot one gave up hunting. Matagi believed that killing a bear in the mountains brought a storm. A Japanese bear hunt is often called kuma taiji, a word used for the slaying of monsters.

In the Hindu epic Ramayana, the bear king Jambavan helps Rama search for Sita and fight Ravana. In Korean tradition, a bear became the woman Ungnyeo and gave birth to Dangun, the founder of the first Korean kingdom. That legend does not name the species, though the black bear is likely the bear of the Korean mountains. A Thai saying compares a grumbling person to a bear eating honey, because the bear mutters as it eats.

In Taiwan the Bunun people call the bear aguman, the devil, and they see bears and humans as kin. For the Bunun, an unjust killing of a bear equals murder and brings disease, death or a burnt millet crop. The Formosan black bear became a symbol of Taiwanese identity in this century, often shown against the panda. In Yann Martel's Life of Pi, the narrator's father calls the species one of the most dangerous animals he keeps.