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brown bear vs. grizzly bear

noun
  1. any of several medium-sized to large bears of the species Ursus arctos, inhabiting North America and Eurasia in dwindling populations, characterized by an upturned muzzle and a hump high on the back and ranging from light tan to near black; formerly considered three distinct species and often still referred to as such: U. horribilis, the grizzly bear; U. middendorffi, the Kodiac bear; and U. arctos, comprising European and Asian brown bears.
noun
  1. a large North American brown bear, Ursus (arctos) horribilis, with coarse, gray-tipped brown fur, once widespread in the western part of the continent as far south as northern Mexico but now restricted to some regions of Alaska, western Canada, and the U.S. Rocky Mountains: a threatened species except in Alaska.