grizzly bear guarding elk calf kill next to yellowstone river in the yellowstone naitonal park in wyoming us

america animal arctos backlit bear black blood boar breath brown calf carcass carnivore dead eating ecotourism elk fawn feeding fog fur grizzly guarding hayden horribilis hunt hunting kill male morning mountain naitonal national next nose park river states steam sunlight sunrise tourism travel united ursus usa vacation valley wet wilderness wildlife wyoming yellowstone