Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.
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Danny Green / Bison (Bison bison) herd walking in line in snow, Yellowstone National Park, Wyoming, USA, February
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Nick Garbutt / Herd of American bison (Bison bison) in snow, Yellowstone National Park, Wyoming, Yellowstone, January.
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Edwin Giesbers / European bisons (Bison bonasus) fighting, Zuid-Kennemerland National Park, the Netherlands. Reintroduced species.
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Edwin Giesbers / European bisons (Bison bonasus) fighting, Zuid-Kennemerland National Park, the Netherlands. Reintroduced species.
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Edwin Giesbers / European bisons(Bison bonasus) fighting, Zuid-Kennemerland National Park, the Netherlands. Reintroduced species.
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Jouan Rius / Bisons (Bison bison), Antelope Island State Park, Great Salt Lake, Utah, USA, March 2014.
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Ingo Arndt / American bisons (Bison bison) Grand Teton National Park, Wyoming, USA, September.
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Danny Green / Bison (Bison bison) close up head portrait, Yellowstone National Park, USA, February
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Danny Green / Bison (Bison bison) herd walking in snow, Yellowstone National Park, Wyoming, USA, February
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Danny Green / Bison (Bison bison) single animal in snow, Yellowstone National Park, Wyoming, USA, February
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Inaki Relanzon / RF - American bisons (Bison bison) in Grand Teton National Park. winter. Wyoming, USA. (This image may be licensed either as rights managed or royalty free.)
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Mark Hamblin / Bison (Bison bison) herd walking through snow towards camera, Yellowstone National Park, Wyoming, USA, June.
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Mark Hamblin / North American Bison (Bison bison) coated in frost standing on snow, Yellowstone National Park, Wyoming, USA, January.
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Ingo Arndt / American bison (Bison bison) herd of adults and calves on prairie, South Dakota, USA September 2014.
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Axel Gebauer / European bisons (Bison bonasus) herd Salanzowy, Kavkazsky Zapovednik, west Caucasus Mountains, Adygea, Russia, February 2013.
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Nick Garbutt / Coyote (Canis latrans) foraging in deep winter snow disturbed by grazing American bison (Bison bison) Hayden Valley, Yellowstone National Park, Wyoming, USA. January.
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Staffan Widstrand / Wild Wonders of Europe / European bison or Wisent (Bison bonasus) male vocalising, Kraansvlak, Kennemerduinen, in the Zuid Kennemerland National Park, Netherlands. Images taken in a huge enclosure, where the bison live a comp...