Peter Cairns / Procession of migrating Elk (Cervus elaphus) and Bison (Bison bison) through the National Elk Refuge, Wyoming, USA, February.
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Jeff Vanuga / Elk {Cervus canadensis} herd on migration in spring out of the National Elk Wildlife Refuge through Grand Teton National Park, Wyoming, USA, May 2009
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Jeff Vanuga / Elk {Cervus canadensis} herd on migration in spring out of the National Elk Wildlife Refuge through Grand Teton National Park, Wyoming, USA, May 2009
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Jeff Vanuga / Elk {Cervus canadensis} female trapped in a corale by the US Fish and Wildife Service and the Wyoming Game and Fish Department await testing by researchers for brucillosis disease. National Elk Refuge...
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Jeff Vanuga / Vehicles approach a herd of Elk {Cervus canadensis} on migration in spring out of the National Elk Wildlife Refuge through Grand Teton National Park, Wyoming, USA, May 2009
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Jeff Vanuga / Elk {Cervus canadensis} trapped in a corale by the US Fish and Wildife Service and the Wyoming Game and Fish Department await testing by researchers for brucillosis disease. National Elk Refuge, Jacks...
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Rolf Nussbaumer / National Elk Refuge, Wyoming, USA, with pair of Trumpeter swans at nest (Cygnus cygnus buccanitor}
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TOM MANGELSEN / Trumpeter Swans taking off on migration, National Elk Refuge, Wyoming USA.
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TOM MANGELSEN / Mallard pair on frozen lake. (Anas platyrhynchos) National Elk Refuge, Wyoming, USA.
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TOM MANGELSEN / American Elk herd in snow. (Cervus elaphus) National Elk Refuge, Jackson, Wyoming, USA.
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TOM MANGELSEN / American Elk herd in snow (Cervus elaphus) National Elk Refuge. Jackson, Wyoming, USA.
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TOM MANGELSEN / American Elk herd in snow. (Cervus elaphus) National Elk Refuge, Jackson, Wyoming, USA.