Bison Running in Snow, Yellowstone National Park, Wyoming

An American bison (Bison bison) runs in the snow near Junction Butte in Yellowstone National Park, Wyoming. Bison are well equipped for harsh winter conditions. They grow a winter coat of woolly underfur, which has coarse hairs that protect them from the elements. The humps on their backs also contain muscles supported by long vertebrae that help swing their heads to move vast amounts of snow.