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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 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 ...
Weights range greatly from the sun bear, which can be as low as 35 kg (77 lb), to the polar bear, which can be as high as 726 kg (1,600 lb). Population sizes vary, with six species classified as vulnerable with populations as low as 500, while the brown bear has a population of over 100,000 and the American black bear around 800,000
The last California grizzly bear sighting was in 1924 and no specimens have been seen since. [29] 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]
Grizzly 399 was a grizzly bear who resided on federal land in a range of hundreds of miles throughout the Grand Teton National Park and the Bridger-Teton National Forest. She was born in a den in Pilgrim Creek, Wyoming, in the winter of 1996. [2] She was captured in 2001 and fitted with a radio collar by the Interagency Grizzly Bear Study Team.
A Marsican brown bear, with a range restricted to the Abruzzo, Lazio and Molise National Park, Italy. While the brown bear's range has shrunk and it has faced local extinctions, it remains listed as a least-concern species by the IUCN, with a total population of approximately 200,000.
A 1959-1970 bear study suggested a grizzly bear population size of about 176, later revised to about 229. [1] Later estimates have ranged as low as 136 and as high as 540; the most recent is a minimum estimate of 236, [1] but biologists think there may be as many as 1,000 bears in the ecosystem. [24]
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.