Large populations occur only in Canada and Alaska.
A few may also be found in Yellowstone and Glacier National Parks. It is sometimes known as the gray bear because of its grizzled hair, and thus its name. Grizzlies mate in mid-summer and are playful and affectionate at this time. Cubs are born in late January or early February usually one or two, occasionally three or four. They mature sexually anywhere from 3 - 5 years of age.