Once found throughout most of the Northern Hemisphere, bison are now found only in limited areas of North America and Europe. Large herbivores, bison typically move in herds composed of cows, calves, and adolescent or elderly males. Bulls of mating age are somewhat more solitary, staying at the fringes of the herd except during the rut, when they compete to mate with the most fecund cows in the herd. The bison's size has protected it from all but the largest natural predators—grizzly bears, wolves, and cougars. The American bison has more commonly been known as the American buffalo, even though bison are a distinct species from buffalo. The American bison once roamed in huge herds from Alaska and northern Canada to northern Mexico, as well ...

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