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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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...