# Sun Bear — Facts, Threats & Conservation

*Helarctos malayanus (Raffles, 1821)*

> Sun bears are the world's smallest bears, native to Southeast Asia, and are listed as Vulnerable by the IUCN; they are threatened by deforestation, the pet trade, and the bear bile industry, in which bears are caged for years and milked for bile used in traditional medicine.

**IUCN status:** Vulnerable  ·  **WARN range:** Indonesia, Malaysia, Vietnam, Thailand, Cambodia

## Quick facts
| Fact | Value |
| --- | --- |
| Lifespan | Up to ~25 years in the wild; ~30+ years in captivity (one record ~36 years) |
| Weight | 25–65 kg (males up to ~one-third larger than females) — the smallest bear species |
| Body length | ~100–150 cm; shoulder height ~70 cm |
| Diet | Omnivore — termites, ants, beetle larvae, bees and honey, figs and other fruit |
| Tongue | Very long — roughly 20–25 cm — to extract honey and insects from deep cavities |
| Gestation | ~95 days (delayed implantation can extend apparent pregnancy to 174–240 days) |
| Young per birth | Usually 1, sometimes 2 cubs; no fixed breeding season near the equator |
| Baby name | Cub |
| Subspecies | Two — H. m. malayanus (mainland + Sumatra) and the smaller H. m. euryspilus (Borneo) |
| CITES | Appendix I — all international commercial trade prohibited |

## Scientific classification
- **Kingdom:** Animalia
- **Phylum:** Chordata
- **Class:** Mammalia
- **Order:** Carnivora
- **Family:** Ursidae
- **Genus:** Helarctos (only living member)
- **Species:** Helarctos malayanus (Raffles, 1821)

## Conservation status
- **Status:** Vulnerable
- **Population:** No reliable global population estimate; numbers are declining across the range
- **Trend:** Decreasing
- **Assessed:** 2017
- **CITES:** Appendix I
- Population estimated to have declined by more than 30% over the last three generations (~30 years; generation length ~10 years).

## Key facts: Sun Bear
- Sun bears are the smallest of the eight bear species, weighing 25–65 kg — comparable in size to a large dog.
- They act as keystone species in Southeast Asian forests, dispersing seeds and excavating tree cavities used by hornbills, flying squirrels and other wildlife.
- Bear bile farming — in which bears are kept in tiny "crush cages" and bile extracted through a fistula or catheter — remains legal only in China; Vietnam banned bile extraction in 2005, though a clandestine trade persists.
- Bear bile contains ursodeoxycholic acid, a genuine medicine, but a synthetic version has been produced since the 1950s — so there is no medical need for farmed bile.
- Sun bear cubs are frequently taken from the wild after their mothers are killed — either for the pet trade or for farming.
- Rescued sun bears are intelligent and need complex, enriched environments; recovery from years of cage confinement can take years, and most can never be released.

## 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 — overwhelmingly Asiatic black bears (moon bears), with sun bears a smaller minority — 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 now legal only in China, where bear bile is used in traditional medicine; Vietnam banned bile extraction in 2005, although a clandestine trade persists and the caged population there has collapsed from around 4,300 bears in 2005 to under 200 by 2024. Bile contains ursodeoxycholic acid, a compound with real applications in treating liver disease and gallstones — but synthetic ursodeoxycholic acid has been available since the 1950s, so no medical use requires farmed bile.

## Sun Bear Habitat Loss
Sun bears depend on intact lowland tropical and montane 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. Across Cambodia, Vietnam, Thailand and Myanmar, forest clearance for agriculture and development is the primary driver of population decline. Sun bears are cryptic and elusive — often crepuscular or diurnal in undisturbed forest but more nocturnal near people — and they travel large home ranges, so 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 challenging 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 the overwhelming majority of bile farm survivors cannot be released into the wild. They require lifetime care at specialist facilities.

## Sun bear vs moon bear (Asiatic black bear) vs sloth bear
| Attribute | Sun bear | Moon bear | Sloth bear |
| --- | --- | --- | --- |
| Scientific name | Helarctos malayanus | Ursus thibetanus | Melursus ursinus |
| Typical weight | 25–65 kg (smallest bear) | ~65–150 kg | ~55–145 kg |
| Chest mark | Orange-cream crescent ('sun') | White V-shape ('moon') | Pale Y/U-shape |
| Coat | Short and sleek | Shaggy | Long and shaggy |
| IUCN status | Vulnerable | Vulnerable | Vulnerable |
| Main range | Tropical SE Asia | S/E Asia, Himalayas | Indian subcontinent |
| Role in bile trade | Smaller share of farmed bears | Large majority of farmed bears | Rarely farmed |

## What WARN does
WARN focuses current bear rescue funding on Indonesia and Malaysia, while keeping the wider China and Vietnam bile-farming context live to explain the welfare crisis and the search demand around it.

A sun bear pulled from a cage or the pet trade can't simply be released — recovering from years of confinement takes specialist veterinary care, enrichment and a forest-edge enclosure that may be needed for the rest of the bear's life. Your gift helps WARN fund local partners in Indonesia and Malaysia who do exactly this work, one bear at a time.

## Frequently asked questions: Sun Bear
### What is bear bile used for?
Bear bile contains ursodeoxycholic acid (UDCA), used in traditional Chinese medicine for conditions including liver disease, gallstones and fever. UDCA is also a mainstream 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 now legal only in China, where it is regulated (though regulation is widely considered inadequate). Vietnam banned bile extraction in 2005, and bear farming has been phased out in South Korea; Japan and most other countries do not permit it. Captive bile bears are overwhelmingly Asiatic black bears (moon bears), with sun bears a smaller share; China's farms hold an estimated several thousand bears.

### How small is a sun bear?
Sun bears weigh between 25 and 65 kilograms — making them the smallest of the eight bear species, roughly comparable to a large dog. Despite their size, they are powerful animals with long, curved claws adapted for climbing trees and tearing open bee nests and termite mounds.

### 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 forage for themselves, have lost their 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 pale orange-to-cream crescent on a sun bear's chest is unique to each individual, like a fingerprint, and is stable enough over time to let researchers identify bears from photographs. It may also serve as a threat display — when a sun bear stands on its hind legs, the patch is prominently shown. The marking is the source of the animal's name, traditionally said to resemble the rising or setting sun.

### Why is it called a sun bear?
The name comes from the pale orange-to-cream crescent on its chest, traditionally likened to the rising or setting sun. The marking stands out against an otherwise short, sleek black coat. Sun bears are sometimes also called honey bears for their fondness for honey and bee larvae.

### Do sun bears hibernate?
No. Because they live in equatorial tropical forest where food is available year-round, sun bears do not hibernate. This also means females can give birth at any time of year rather than after a winter denning period.

### What is the difference between a sun bear and a moon bear?
Both are Asian bears caught up in the bile trade. The sun bear (Helarctos malayanus) is the world's smallest bear (25–65 kg), with a short coat and a sun-like orange chest crescent. The moon bear, or Asiatic black bear (Ursus thibetanus), is larger (often 65–150 kg), shaggier, and has a broad white V-shaped chest mark. Moon bears make up the large majority of farmed bile bears.

## Sources
- [IUCN Red List — Helarctos malayanus (Scotson et al. 2017)](https://www.iucnredlist.org/species/9760/123798233)
- [CITES Appendices (Appendix I)](https://cites.org/eng/app/appendices.php)
- [IUCN/SSC Bear Specialist Group — Sun Bear (bearbiology.org)](https://www.bearbiology.org/the-eight-bear-species/helarctos-malayanus-sun-bear/)
- [Smithsonian's National Zoo — Sun Bear](https://nationalzoo.si.edu/animals/sun-bear)
- [Animal Diversity Web — Helarctos malayanus](https://animaldiversity.org/accounts/Helarctos_malayanus/)
- [National Geographic — Bear bile, explained](https://www.nationalgeographic.com/animals/article/bear-bile-trade-explained)

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Full guide: https://worldanimalrescuenetwork.org/wildlife-guides/sun-bear