Tien Shan Brown Bear
Scientific name Ursus arctos isabellinus
Adult size
- Weight
- ♀F 100 kg ♂M 200 kg
- Length
- ♀F 1.65 m ♂M 1.9 m
- Shoulder height
- ♀F 0.85 m ♂M 0.95 m
- Top speed
- ♀F 50 km/h ♂M 50 km/h
- Lifespan
- Subspecies-specific lifespan is not pinned down; wider Brown Bear records show wild bears can live 20-30 years, with rare wild females recorded to 37.
Tien Shan brown bears are high-mountain brown bears of Central Asia, living in broken alpine bands from the Himalaya, Karakoram, Hindu Kush, Pamir, Tien Shan, and Altai-Sayan ranges. They use cold meadows, scrub, rocky slopes, and the upper edge of conifer forest, mostly between about 2,500 and 5,000 metres. The Tien Shan are the "Heavenly Mountains" running through Kyrgyzstan, Kazakhstan, and western China.
The range
Five regions, one species.
The tien shan brown bear doesn't live in one place. Across the map below, each region has its own pressures, prey, and politics — same biology, different worlds.
Kazakhstan
Altyn-Emel National Park
Northern periphery of the subspecies' range; Tien Shan foothill landscape bridging alpine habitat to the north and semi-desert/steppe to the south. Sympatric with the steppe wolf (Canis lupus campestris), which explains why the park matters to Bori's natural-rival story. Official Altyn-Emel fauna lists wolf, Tien Shan brown bear, lynx, and snow leopard in the park. Brown-bear / gray-wolf carcass competition is supported by Scandinavia and Yellowstone evidence, but should be treated here as analogy, not a measured Altyn-Emel mechanism.
Source ↗Pakistan
Deosai National Park (Gilgit-Baltistan)
Largest single wild population of U. a. isabellinus — ~58–77 bears on the most recent systematic survey; ~73% of modelled suitable habitat for the Pakistan population sits inside park boundaries. Park elevation 3,500–5,200 m; ~60% of habitat between 4,000–4,500 m. Listed Critically Endangered in Pakistan's national assessment.
Source ↗Pakistan
Khunjerab National Park (Pakistan–China border)
Karakoram high-altitude population at the Pakistan–China border. Sympatric with snow leopard, Himalayan ibex, blue sheep. Small and fragmented; serves as a connectivity corridor between Deosai to the west and the Chinese Xinjiang Tien Shan populations to the north-east.
Source ↗India
Hemis National Park (Ladakh)
Core Indian range for U. a. isabellinus — Trans-Himalayan high-altitude habitat. Regional status far worse than species-level LC; Indian national assessments list the subspecies at Critically Endangered in much of its state-level range. Sympatric with snow leopard and Tibetan wolf.
Source ↗Kyrgyzstan
Sarychat-Ertash State Reserve (Inner Tien Shan)
Inner Tien Shan alpine-meadow and subalpine habitat. Kyrgyz Tien Shan holds an estimated 400–450 bears across all protected areas combined — the largest Central-Asian national population north of the Hindu Kush. Sympatric with snow leopard, argali sheep, Tien Shan ibex and wolves.
Source ↗
Daily life
What the tien shan brown bear does, day to day.
Diet, social behaviour, climate — the everyday biology that shapes how this species hunts, defends and survives.
Diet
Omnivorous, with one of the most plant-heavy diets of any Ursus arctos subspecies.
Social life
Solitary apart from mother–cub family groups (cubs stay with the mother 2–3 years).
Climate
High-mountain subalpine and alpine. Typical occupancy band 2,500–5,000 m elevation across the Himalaya–Karakoram–Pamir–Tien Shan arc; in Deosai NP (Pakistan) ~60% of habitat sits between 4,000–4,500 m.
Wyld Trivia
Five questions. Most people get them wrong.
But you're not most people.
Tap to reveal.
Why is the Tien Shan brown bear smaller than its cousins?
Show meHideBecause it lives where there's less to eat. Ursus arctos isabellinus is one of the smallest brown-bear subspecies. It lives at 2,500 to 5,000 metres — high in the Himalaya, Karakoram, Pamir, and Tien Shan. Up there, food is scarce and the growing season is short. Smaller bodies need less fuel. Bigger doesn't always win — at altitude, smaller is sustainable.
What does a brown bear eat at the top of the world?
Show meHideMostly plants by VOLUME — and more meat than you'd think by ENERGY. A 2019 study in Pakistan's Deosai National Park tracked Himalayan brown bear diet via scat analysis. By volume, 70% of samples contained only plant matter and 93% contained grasses or sedges. But the paper points out that volume and energy tell different stories — marmots they dig out of burrows are a much bigger share of the actual digestible energy than the volume alone suggests. They generally AVOID livestock where shepherds and dogs are around. They're alpine grass-grazers AND marmot hunters.
What does Yeti DNA actually turn out to be?
Show meHideMostly Tibetan brown bear, plus a few surprises. A 2017 mitochondrial-genome study (Lan, Zhu, Lindqvist et al.) analysed nine 'Yeti' samples from museums and collections. The phylogenetic tree shows: one falls in the Himalayan brown bear lineage (the species in this profile), most of the others fall in the Tibetan brown bear lineage on the plateau, one is an Asian black bear, and one is a dog. Eight of nine are some kind of bear — but most of them are the Tibetan cousin, not the Himalayan brown bear. The Yeti legend traces to two real mountain bear species, with a dog and an Asian black bear sample muddled in.
What happens when wolves and brown bears find the same kill?
Show meHideBears come out ahead — at least where it's been carefully studied. A 2017 study (Tallian et al., Proc R Soc B) tracking wolves and bears in Scandinavia and Yellowstone found wolves had longer intervals between kills when brown bears were present — meaning bears reduce wolf kill rates rather than the reverse. The mechanism is bears displacing wolves at carcasses. Central Asian brown bears overlap with wolves and snow leopards in similar mountain landscapes; whether the same pattern holds out there has been observed but not tested with the same study design.
How many Himalayan brown bears are left in the wild?
Show meHidePakistan's Deosai National Park holds the largest known population — about 58 to 77 bears in the most recent count. That's one of the BIGGEST remaining populations of this subspecies. The IUCN status in Pakistan is Critically Endangered. Around 73% of suitable habitat sits inside the park; outside, connectivity is fragile. We're talking about saving a few dozen bears at a time. Not millions. Dozens.
The terrain
Where the tien shan brown bear thrives.
Every animal is built for some places more than others. These are the ground, hours and weather where this species shows its best — and its worst.
Ground
- Alpine meadowExcels
- Subalpine scrubExcels
- Mountain forestStrong
- Rocky terrainStrong
- SteppeAverage
- LowlandStruggles
- DesertAvoids
Hours
- DawnExcels
- DuskExcels
- TwilightExcels
- DayStrong
- NightAverage
Weather
- ColdExcels
- ModerateExcels
- RainStrong
- WindAverage
- HotStruggles
- StormStruggles
Five things you didn't know about the tien shan brown bear.
Cited biology that shapes how the tien shan brown bear hunts, fights, survives.
Ursus arctos isabellinus is one of the smallest-bodied subspecies of brown bear in the Asian range — adapted to extreme altitude (typical band 2,500–5,000 m) and the resource-scarce alpine meadow / cushion-forb vegetation band. Across the Himalaya–Karakoram–Pamir–Tien Shan arc the subspecies occupies habitat above the coniferous forest line, with bears absent below ~1,000 m (landscape degradation) and above ~5,000 m (food scarcity). Source ↗
Himalayan brown bears in Deosai National Park (Pakistan) have a strongly plant-dominated diet by scat volume. One scat-analysis study recorded 70% of scats containing only plant matter and grasses or sedges appearing in 93%. Crucially, the study distinguishes scat volume from digestible diet by energy — animal matter, principally golden marmots excavated from alpine burrows, contributes a substantially larger share of digestible energy than the scat-volume figures alone suggest. Both framings are true; "70% plants by volume" and "marmots provide major nutritional protein" describe the same diet from different axes. Livestock are generally avoided where shepherds and dogs are present. Source ↗
Mitochondrial-genome phylogenetics (Lan, Zhu, Lindqvist et al. 2017, Proc. Roy. Soc. B) placed the Himalayan brown bear lineage as an early-diverging branch within Ursus arctos, with divergence dating to approximately 658,000 years ago. The same study analysed nine purported Yeti samples — phylogenetic placement showed one falling within the Himalayan brown bear lineage (U. a. isabellinus), most of the remaining brown-bear samples falling within the Tibetan brown bear lineage (U. a. pruinosus) of the plateau, one sample resolving as Asian black bear, and one as a dog. Eight of nine purported Yeti samples are some kind of bear; only one is the Himalayan brown bear specifically, with most being its Tibetan sister taxon. Source ↗
Where Ursus arctos and gray wolves (Canis lupus) are sympatric in Scandinavia and Yellowstone, brown bear presence reduces wolf kill rates rather than the reverse — wolves had longer intervals between kills when bears were present (Tallian et al. 2017, Proc. Roy. Soc. B). The interference mechanism is bear-on-wolf carcass-displacement at kill sites. The paper's empirical data is from Scandinavia and Yellowstone; whether the same mechanism operates uniformly in Central Asian mountain systems where bears, wolves and snow leopards overlap is reported in regional accounts but has not been tested with the same study design. Source ↗
The Deosai National Park (Pakistan) population — the largest single wild population of U. a. isabellinus — was estimated at 58–77 bears in the most recent systematic survey (Frontiers in Ecology and Evolution, 2024). The regional status reflects the fragmentation of the Himalayan and Tien Shan populations: isabellinus is listed as Critically Endangered in Pakistan's national assessment. ~73% of modelled suitable habitat for the population sits inside Deosai NP; connectivity beyond park boundaries is fragile. Source ↗
About the tien shan brown bear
Where the tien shan brown bear sits on the tree of life.
Class
Mammalia
Warm-blooded animals with fur or hair that feed their young milk.
Order
Carnivora
Mostly meat-eating mammals — cats, dogs, bears and their relatives.
Family
Ursidae
The bear family — large, strong, mostly omnivorous.
Species
Ursus arctos isabellinus
Tien Shan Brown Bear — the species this page is about.
Tien Shan Brown Bear
Every fact, cited.
Biology cited on this page comes from peer-reviewed zoology and the major species databases. Click through for the underlying study, dataset or assessment.
- bearbiology.org · bearbiology.org
- PLOS · PLOS
- PubMed · PubMed
- PubMed · PubMed
- frontiersin.org · frontiersin.org
