The grizzly bear also known as the silvertip bear, the grizzly, or the North American brown 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 from eastern Russia 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 produce one to four young commonly two which are small and weigh only about 500 grams. A female bear is protective of her offspring and will attack if she thinks she or her cubs are threatened or endangered in anyway.
The word "grizzly" in its name refers to grizzled or grey hairs in its fur. Brown bears are found in Asia, Europe and North America giving them one of the widest ranges of bear species. The ancestors of the grizzly bear originated in Eurasia and traveled to North America approximately 50,000 years ago. This is a very recent event in evolutionary time, causing the North American grizzly bear to be very similar to the brown bears inhabiting Europe and Asia.
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