Brown Bear

Brown Bear facts at a glance

How big is a brown bear?

An adult brown bear measures 2.8 m long — about 1.6× the height of an average adult person (1.73 m) — and weighs around 350 kg, about 5.0× an average adult’s body weight (70 kg).

What is a group of brown bears called?

Explore more animal collective nouns and baby animal names .

Diet and seasonal feeding

Brown bears are omnivores whose diet shifts with the seasons. In spring they graze on sedges and roots; summer brings berries and insects; autumn is dominated by hyperphagia as bears pack on fat before winter. Coastal bears gather at salmon runs, while inland populations rely more on plants and small mammals.

Hibernation and reproduction

Pregnant females enter dens in late autumn and give birth during hibernation, usually to one to three cubs that nurse and grow inside the den until spring. Hibernation slows heart rate and metabolism dramatically, allowing bears to survive months without eating, drinking, or passing waste.

Range and subspecies

Brown bears once ranged across much of western North America, Europe, and temperate Asia. Today they persist in Scandinavia, the Carpathians, the Rockies, Alaska, and Russia's Kamchatka Peninsula. The North American grizzly and the Kodiak bear are well-known subspecies of Ursus arctos.

Conservation and human conflict

Globally listed Least Concern, brown bears nevertheless face local declines from habitat fragmentation, poaching, and conflict with livestock. Responsible bear-country practices — securing food, carrying deterrents, and giving mothers with cubs space — reduce dangerous encounters.

Did you know? Brown Bear facts

• The brown bear is one of the world's largest land carnivores, found across North America, Europe, and Asia.
• Grizzly bears are a subspecies of brown bear (Ursus arctos horribilis) found mainly in inland North America. Coastal brown bears that eat more salmon tend to grow larger. All grizzlies are brown bears, but not all brown bears are grizzlies.
• Most adult males weigh 180–360 kg (400–800 lb), while females are smaller. Exceptional coastal males in Alaska and Kamchatka can exceed 600 kg when salmon is abundant.
• Yes. Brown bears enter a deep winter dormancy for several months, living off stored body fat. Their heart rate and body temperature drop, and females may give birth inside the den during this period.
• Brown bears usually avoid people, but surprise encounters, food-conditioned bears, and mothers defending cubs can be dangerous. Wildlife agencies advise making noise on trails, storing food properly, and never running from a bear.
• Conservation: Least Concern (IUCN).

Diet & feeding

Brown Bear feeds primarily as a omnivore — berries, fish, roots, insects, and carrion. Brown bears are omnivores whose diet shifts with the seasons. In spring they graze on sedges and roots; summer brings berries and insects; autumn is dominated by hyperphagia as bears pack on fat before winter. Coastal bears gather at

Adaptations

• Brown bears are omnivores whose diet shifts with the seasons. In spring they graze on sedges and roots; summer brings berries and insects; autumn is dominated by hyperphagia as bears pack on fat before winter. Coastal bears gather at salmon runs, while inland populations rely more on plants and small mammals.
• Pregnant females enter dens in late autumn and give birth during hibernation, usually to one to three cubs that nurse and grow inside the den until spring. Hibernation slows heart rate and metabolism dramatically, allowing bears to survive months without eating, drinking, or passing waste.

Behaviour & ecology

• Brown bears are omnivores whose diet shifts with the seasons. In spring they graze on sedges and roots; summer brings berries and insects; autumn is dominated by hyperphagia as bears pack on fat before winter. Coastal bears gather at salmon runs, while inland populations rely more on plants and small mammals.
• Pregnant females enter dens in late autumn and give birth during hibernation, usually to one to three cubs that nurse and grow inside the den until spring. Hibernation slows heart rate and metabolism dramatically, allowing bears to survive months without eating, drinking, or passing waste.
• Brown bears once ranged across much of western North America, Europe, and temperate Asia. Today they persist in Scandinavia, the Carpathians, the Rockies, Alaska, and Russia's Kamchatka Peninsula. The North American grizzly and the Kodiak bear are well-known subspecies of Ursus arctos.

Communication

• Brown Bear uses scent, posture, and vocal signals to mark territory and coordinate social behaviour.
• Communication intensity often peaks during breeding seasons and territorial disputes.

Habitat & range

Forests, mountains, and tundra across the Northern Hemisphere

Ecological role

Brown Bear plays a recognised ecological role in forests, mountains, and tundra across the northern hemisphere.

Conservation status of the Brown Bear

Sources & references

This guide is compiled and reviewed against established zoological and conservation references. Key sources for the Brown Bear:

• IUCN Red List of Threatened Species

  Conservation status (Least Concern) reflects the IUCN Red List category for Ursus arctos, most recently assessed in 2017.

• iNaturalist — observations & photos

  Search citizen-science observations and community IDs for Ursus arctos. Useful for range checks and recent sightings — not a substitute for formal Red List status.

• GBIF — occurrence data

  Global Biodiversity Information Facility species search for Ursus arctos. Explore published occurrence records used in range research.

• IUCN Red List — Ursus arctos.

  Conservation status (Least Concern) and population trends.

• Animal Diversity Web — Ursus arctos. University of Michigan Museum of Zoology.

  Life history, morphology, and range.

• Wikipedia — Brown Bear.

  General taxonomy and overview (cross-check primary sources).

• Global Animal Guide editorial standards

  How we research, source, review, and update every guide for accuracy.