The grizzly bear (Ursus arctos ssp.) is any North American morphological form or subspecies of brown bear, including the mainland grizzly (Ursus arctos horribilis), Kodiak bear (U. a. middendorffi), peninsular grizzly (U. a. gyas), and the recently extinct California grizzly (U. a. californicus†) and Mexican grizzly bear (U. a. nelsoni†). Scientists do not use the name grizzly bear but call it the North American brown bear. (See brown bear for a discussion of brown bears outside of North America). It should not be confused with the black grizzly or Ussuri brown bear (U. a. lasiotus) which is another giant brown bear inhabiting Russia, Northern China, and Korea.

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