A bison resting next to a fumarole on the hot ground of the Black Sand Geyser Basin in Yellow Stone National Park, Wyoming, USA
Two American bisons resting on the hot ground of the Black Sand Geyser Basin in Yellow Stone National Park, Wyoming, USA
A mat of orange thermophilic bacteria forms the outer ring of the Emerald Pool. Black Sand Geyser Basin, Yellowstone National Park, Wyoming, USA
