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  1. Home
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  3. Grizzly Bear

One of the 8 bears on WAnimals

Mammals · Carnivora · Ursidae

Grizzly Bear

Ursus arctos horribilis

Not Evaluated

It has not yet been assessed against the IUCN criteria.

Spotted something wrong?

The grizzly is the interior subspecies of the brown bear in North America, smaller than the coastal bears of Alaska because it has less salmon available. It is omnivorous and opportunistic: roots, berries, insects, rodents, carrion and ungulates according to the season. It is recognised by the muscular hump over the shoulders and the concave facial profile. It once occupied the whole western half of the United States and today survives in Alaska, western Canada and a few ecosystems of the Rockies.

Weight

130 kg – 360 kg

Size

1.8 m – 2.5 m

Life expectancy

25 years

Diet

Omnivore

Combines animal and plant food depending on availability.

Activity

Crepuscular

Active mainly at dawn and dusk.

Social structure

Solitary

Lives and hunts alone, joining others only to breed.

Temperate forestMountainTundraGrassland
2countries26parks8same family

Fun facts

  • GeneralA subspecies of brown bear; it puts on as much as 180 kg before hibernating, on salmon and berries.
  • The hump on its back is muscle, not fat: it is what drives the forelimbs when digging, and it is the most reliable feature for telling it apart from the black bear.
  • During hibernation it goes for months without eating, drinking or defecating, and even so it barely loses muscle mass or bone density; that mechanism is being studied as a route to treating human osteoporosis and muscle wasting.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (mammal)
Habitat and environment
Forest, alpine meadows, tundra and river valleys of western North America
Birth weight
400 - 500 g
Size at birth
About 30 cm; born blind and almost hairless, while the mother hibernates
Sexual maturity
5 years
Gestation / incubation
7 months (with delayed implantation)
Litter / clutch size
2

Sources consulted: Wikipedia (es): Ursus arctos horribilis

Where to find it

Best time: From July to September in Alaska and British Columbia, during the salmon run, when they gather at rivers such as those of Katmai.

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The pins mark the parks where its presence is documented.

Where to see it

Parks and dive sites where this species has been documented — showing 10 of 26.

Related species

Other species in the catalogue with the most in common with Grizzly Bear — same habitat, park, country, tags or family.

Same taxonomic family
Same taxonomic family
Same taxonomic family
Shares a park
Shares a park
Shares a park

Keep exploring

Based on what we already know about grizzly bear.

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See full glossary
This page in other languages: Español · Deutsch · Français · Português · Italiano
See its range on the interactive map→
Yellowstone National ParkUnited States
GlacierUnited States
DenaliUnited States
Glacier BayUnited States
Wrangell-St. EliasUnited States
Grand TetonUnited States
BanffCanada
JasperCanada
YohoCanada
Waterton LakesCanada
See all 26 parks
American Black BearLeast Concern

American Black Bear

Ursus americanus

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Ursus arctos

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Ursus maritimus

Least Concern

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Neotoma cinerea

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North American Porcupine

Erethizon dorsatum

Snowshoe HareLeast Concern

Snowshoe Hare

Lepus americanus

CountriesCanada
ParksYellowstone National ParkUnited States
TagsOmnivore
Omnivore
Crepuscular
Solitary
Temperate forest
Mountain
Tundra
Grassland
Mammal
Canada
United States