horribilis is limited to North America and historically existed throughout much of the western half of the contiguous United States, central Mexico, western Canada and most of Alaska. arctos, that occurs in North America, Europe and Asia. Grizzly bears, Ursus arctos horribilis, are a member of the brown bear species, U. Grizzly bears are long-lived mammals, generally living into their mid to late 20s, although some wild bears have lived for over 35 years. The coat features longer guard hairs over a dense underfur with tips that are usually silver or golden in color hence the name grizzly. They can be distinguished from black bears by longer, less curved front claws, humped shoulders, and a facial profile that appears concave. Their coloration varies from light brown to nearly black. Adult males average 200 to 300 kilograms (kg) (400 to 600 pounds (lb)) and adult females 110 to 160 kg (250 to 350 lb) in the lower-48 States. Grizzly bears ( Ursus arctos horribilis) are generally larger and heavier than other bears.
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