Grizzly Bear

Ursus arctos horribilis (subspecies), “Brown Bear”, “Alaska Peninsula Brown Bear”

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The grizzly bear (Ursus arctos horribilis), also known as the North American brown bear or simply grizzly, is a population or subspecies of the brown bear inhabiting North America. In addition to the mainland grizzly (Ursus arctos horribilis), other morphological forms of brown bear in North America are sometimes identified as grizzly bears. These include two living populations — the Kodiak bear (U. a. middendorffi) and the peninsular grizzly (U. a. gyas) — as well as the extinct California grizzly (U. a. californicus†), Mexican grizzly (formerly U. a. nelsoni†), and Ungava-Labrador grizzly (formerly U. a. ungavaesis†). On average, grizzly bears near the coast tend to be larger while inland grizzlies tend to be smaller. The Ussuri brown bear (U. a. lasiotus), inhabiting Russia, Northern…

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Grizzly sow and cubs forage for food along Yellowstone National Park’s Obsidian Creek, Jacob W. Frank (NPS) three photographs above.

FOOD SOURCES

Pond Weed:

Investigating a bear dig site, holding pond weed, Jacob W. Frank (NPS) photograph above.

Yellowstone grizzly bear dig site for pond weed, Jacob W. Frank (NPS) photograph above.

Close up view of pond weed roots at a Yellowstone bear dig site, Jacob W. Frank (NPS) photograph above.

Whitebark Pine Seeds:

Investigating a Yellowstone bear dig site, scat filed with whitebark pine seed, Jacob W. Frank (NPS) photograph above.

Bison:

Grizzly bear on bison carcass in Yellowstone’s Lamar Valley, Jim Peaco (NPS) photograph above.

HABITAT

Day Beds:

A Yellowstone NPS biological technician and Montana State University graduate student take measurements of a grizzly day bed site, Jacob W. Frank (NPS) two photographs above.