American bison, bison, buffalo, Bison bison, mammal, animal, wildlife, fauna, ungulate, prairie, plains, grassland, bull, cold, freezing, winter wildlife, yellowstone, national Park, np, n.p., snow, ice, tough, strength, power, strong, determination, vertical, cover, endurance, freeze, icy, winter, wyoming wildlife, durable, endure, hardship, kid, kids