bison, American bison, buffalo, Bison bison, mammal, mammals, animals, ungulates, grasslands, animal, wildlife, fauna, ungulate, prairie, plains, grassland, bull, fight, aggressive, aggression, conflict, behavior, sparring, dominance behavior, rutting behavior, rut, mating, breeding, rutting, plains, prairie, Theodore Roosevelt National Park, North Dakota, North America, horizontal, Lewis & Clark, dust, photo, photos, photograph, photographs, image, images, picture, pictures, stock, of, agency, leesonphoto