The Grizzly Bear, sometimes called the Silvertip Bear, is a powerful bear
that lives in the uplands of western North America. It has traditionally been treated as a subspecies,
Ursus arctos horribilis, of the brown bear living in North America.
Grizzly bears reach weights of 180–680 kilograms (400–1,500 pounds) and stand 2.44 m (8 ft) tall on its hind legs.;
the male is on average 1.8 times as heavy as the female, an example of sexual dimorphism. This dimorphism suggests
that size is an important factor in the male's ability to successfully compete for and attract breeding opportunities.
Their coloring ranges widely across geographic areas, from blond to deep brown or black. These differences, once
attributed to subspeciation, are now thought to be primarily due to the different environments these bears inhabit,
particularly with regard to diet and temperature. Grizzlies can be distinguished from most other brown bear subspecies
by their proportionately longer claws and cranial profile which resembles that of the polar bear.
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