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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 [4] 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.
Brown and grizzly bears have been seen moving increasingly northward into territories formerly claimed by polar bears. They tend to dominate polar bears in disputes over carcasses, [133] and dead polar bear cubs have been found in brown bear dens. [134]
The Ussuri brown bear (Ursus arctos lasiotus), also known as the Ezo brown bear, Russian grizzly bear, or the black grizzly bear, [3] is a subspecies of the brown bear or a population of the Eurasian brown bear (U. a. arctos). [which?] One of the largest brown bears, a very large Ussuri brown bear may approach the Kodiak bear in size. [4]
Brown bear size, most often measured in body mass, is highly variable and is correlated to extent of food access. Therefore, bears whose range in areas with access to openings, cover, and moisture or water are on average larger, whereas those bears that range into enclosed forested areas or arid, sparsely vegetated regions, both of which tend to be suboptimal foraging habitat for brown bears ...
The Alaska Peninsula brown bear's name most likely arose because, until 1975, it was considered a different species from the inland grizzly bear. It was never considered closer to European brown bears than inland grizzlies, but was given a different name, due to the size and color differences of coastal brown bears and inland grizzlies.
The California grizzly bear (Ursus arctos californicus [3]), also known as the California golden bear, [4] is an extinct population of the brown bear, [5] generally known (together with other North American brown bear populations) as the grizzly bear. "Grizzly" could have meant "grizzled" – that is, with golden and grey tips of the hair ...
A small brown bear population once lived in the northern parts of Mexico, New Mexico, and Arizona. [30] This population is now extinct as the last known Mexican grizzly bear was shot in 1976. [31] These bears were smaller and lighter than the Canadian and United States brown bear population.
Brown bear (including the subspecies grizzly bear) incidents have occurred in its native range spanning Alaska, Northern Canada, and Western Canada, and portions of the Rocky Mountains in the United States. The locations of black bear wilderness fatal attacks reflect its wider range.