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Wildlife Guide · Indonesia & Malaysia

Sun Bear

Helarctos malayanus

The smallest bear on earth — kept in cages for bile, or taken as cubs for pets.

IUCN: Vulnerable
Sun bear at a rescue sanctuary in Southeast Asia

In brief

Sun bears are the world's smallest bears, native to Southeast Asia; they are threatened by deforestation and the bear bile farming industry, in which bears are caged for decades and milked for bile used in traditional medicine.

35%

Population decline in last 30 years

20+

Years a bile bear may be caged

10,000+

Bears on bile farms in Vietnam and China

1,000+

Bear sanctuaries needed — fewer than 10 exist

Key Facts: Sun Bear

  • Sun bears are the smallest of the eight bear species, weighing 25–65 kg — smaller than most domestic dogs.
  • They are keystone species in Southeast Asian forests, dispersing seeds and excavating cavities used by other wildlife.
  • Bear bile farming — in which bears are kept in tiny "crush cages" and bile extracted through catheters — is legal in China and Vietnam.
  • Bear bile contains ursodeoxycholic acid, which has genuine medical applications, but synthetic alternatives have been available for decades.
  • Sun bear cubs are frequently taken from the wild after their mothers are killed — either for bile farming or the pet trade.
  • Rescued sun bears are highly intelligent and require complex, enriched environments; recovery from bile farm conditions can take years.

What Is Bear Bile Farming?

Bear bile farming is the practice of keeping bears in captivity and extracting bile from their gallbladders, typically through a permanently open hole (fistula) or a surgically implanted catheter. Farmed bears — mostly Asiatic black bears (moon bears) and sun bears — are often confined in "crush cages" so small they cannot stand upright or turn around. Some remain in these conditions for twenty years or more. The practice is legal in China and Vietnam, where bear bile is used in traditional medicine. Bile contains ursodeoxycholic acid, a compound with genuine applications in treating liver disease — but synthetic ursodeoxycholic acid has been available since the 1950s.

Sun Bear Habitat Loss

Sun bears depend on intact lowland tropical forest. The conversion of Bornean and Sumatran forest to oil palm has eliminated vast areas of suitable habitat and brought bears into direct conflict with plantation workers, who frequently kill them as crop raiders. In Cambodia, Vietnam, and Thailand, forest clearance for agriculture and development is the primary driver of population decline. Sun bears are rarely photographed in the wild — they are shy, nocturnal, and travel large home ranges — meaning population declines often go undetected until local extinction has already occurred.

Life After the Bile Farm

Bears rescued from bile farms are among the most challenged animals to rehabilitate. Years of physical constraint cause muscle atrophy, joint deformity, and dental damage. Psychological trauma manifests as stereotypic behaviour — repetitive rocking, pacing, and bar-biting — that can persist for years in sanctuary conditions. Enrichment programmes, social companionship, and large naturalistic enclosures significantly improve outcomes, but most bile farm survivors cannot be released into the wild. They require lifetime care at specialist facilities.

What WARN Does

WARN funds sanctuary capacity expansion for rescued sun and moon bears in Vietnam and Indonesia, supports confiscation operations, and backs veterinary training for rescue teams dealing with bile farm survivors.

Donate to WARN

Sun Bear: Frequently Asked Questions

What is bear bile used for?
Bear bile contains ursodeoxycholic acid (UDCA), which is used in traditional Chinese medicine for conditions including liver disease, gallstones, and fever. UDCA is also used in Western medicine — but the synthetic version, produced pharmaceutically, has been available since the 1950s. There is no medical need to use farmed bear bile.
Is bear bile farming legal?
Bear bile farming is legal in China and Vietnam, where it is regulated (though regulation is widely considered inadequate). It is banned in South Korea, Japan, and most other countries. The farms in China and Vietnam collectively hold an estimated 10,000–20,000 bears, primarily Asiatic black bears (moon bears) and sun bears.
How small is a sun bear?
Sun bears weigh between 25 and 65 kilograms — making them the smallest of the eight bear species. A large sun bear is smaller than a Labrador retriever. Despite their size, they are powerful animals with long claws adapted for climbing trees and tearing open bee nests.
Can sun bears rescued from farms be released into the wild?
Very rarely. Most bears rescued from bile farms have spent years in conditions that cause irreversible physical and psychological damage. They cannot hunt, have no fear of humans, and lack the spatial knowledge needed to survive in the wild. Almost all require permanent sanctuary care.
What is a sun bear's chest patch for?
The distinctive golden or white crescent-shaped patch on a sun bear's chest is unique to each individual, like a fingerprint. Researchers believe it may serve as a threat display — when a sun bear stands on its hind legs, the patch is prominently displayed. Each bear's marking is sufficiently unique to allow individual identification in the field.

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