The grizzly bear, also known as the silvertip bear, is a subspecies of brown bear that generally lives in the uplands of western North America. This subspecies is thought to descend from Ussuri Brown Bears which crossed to Alaska 100,000 years ago, though they did not move south until 13,000 years ago. Grizzlies are normally solitary active animals, but in coastal areas the grizzly congregates alongside streams, lakes, rivers, and ponds during the salmon spawn. Every other year, females (sows) produce one to four young (commonly two) which are small and weigh only about 500 grams (one pound). A sow is protective of her offspring and will attack if she thinks she or her cubs are threatened.

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