Stock photography, photos: American bison Stock photos of American bison Photograph: © Esa Hiltula Click for a larger image and more information Keywords associated with this stock photo: American, bison, buffalo, bull, male, macho, heavy, animal, mammal, hairy, hair, fur, endangered, species, nature, wildlife, horns, winter, snow, cold, sunny, environment, west, plains, hoof, hooved, hooves, brown, white, outdoors,