American bison wintering at Fountain Flats, Yellowstone National Park, Wyoming, USA

American bison wintering at Fountain Flats, Yellowstone National Park, Wyoming, USA

© Jeff Vanuga/Corbis

American bison wintering at Fountain Flats, Yellowstone National Park, Wyoming, USA

American bison wintering at Fountain Flats, Yellowstone National Park, Wyoming, USA

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