Stock photography, photos: Bull Elk Stock photos of Bull Elk in Yellowstone National Park Photograph: © Cary Ulrich Click for a larger image and more information Keywords associated with this stock photo: bull, elk, wildlife, artiodactyls, cervidae, mammal, yellowstone, national, park, wyoming, nature, wilderness, antlers, male, velvet, evergreen trees, evergreen, trees, meadow, bull elk