Sebastian Kennerknecht / American Bison (Bison bison) herd grazing in winter, Gardiner, Yellowstone National Park, Montana
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Sebastian Kennerknecht / American Bison (Bison bison) herd grazing in winter, Gardiner, Yellowstone National Park, Montana
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Sebastian Kennerknecht / American Bison (Bison bison) bull browsing in winter, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female cleaning nose with tongue, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female in winter, Yellowstone National Park, Wyoming
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Sebastian Kennerknecht / American Bison (Bison bison) female covered with frost in winter, Yellowstone National Park, Montana
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Daniel J. Cox / Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming
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Jim Manthorpe / American bison (Bison bison) feeding, Yellowstone National Park, Wyoming, USA, August.
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Danny Green / RF - Bison (Bison bison) breathing in the cold air, Yellowstone National Park, USA, February (This image may be licensed either as rights managed or royalty free.)
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Ingo Arndt / Burned trees in front of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, September 2011.
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Ingo Arndt / Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA, September 2011.
