Stock photography, photos: Herd of elk in autumn Stock photos of Bull elk with harem of cows during the autumn rut in Yellowstone National Park Photograph: © D. Robert Franz Click for a larger image and more information Keywords associated with this stock photo: elk, wapati, bull, harem, herd, cow, wild, wildlife, fall, autumn, Yellowstone National Park, Wyoming, mammal, vertebrate, antlers, trophy, game,