Ключевые слова: america, american, animal, bison, brown, buffalo, bull, calf, cow, field, fur, grass, grassland, graze, grazing, green, herd, hoofed, landscape, large, mammal, meadow, national, national park, nature, outdoor, outdoors, park, plains, prairie, river, summer, tourism, travel, usa, west, wild, wilderness, wildlife, wyoming, yellowstone, yellowstone national park,