bison bull, Bison bull, bison, american bison, buffalo, bull, bulls, males, male, vertical, strong, strength, power, powerful, prairie wildlife, North America, North Dakota, Theodore Roosevelt National Park, mammal, mammals, ungulates, animals, ungulate, animal, wildlife, fauna, Bison bison, western symbol, plains, grasslands, grassland, photo, photos, photograph, photographs, image, images, picture, pictures, stock, of, agency, leesonphoto