Sebastian Kennerknecht / Minden / American Bison (Bison bison) female in winter, Yellowstone National Park, Wyoming
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Suzi Eszterhas / American Bison (Bison bison) cow and calf playing, Yellowstone National Park, Montana
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Donald M. Jones / American Bison (Bison bison) running in snow, Yellowstone National Park, Wyoming
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Donald M. Jones / American Bison (Bison bison) in winter, Yellowstone National Park, Wyoming
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Donald M. Jones / American Bison (Bison bison) herd in grassland, National Bison Range, Moise, Montana
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Donald M. Jones / American Bison (Bison bison) dust bathing, National Bison Range, 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) 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 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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Sebastian Kennerknecht / American Bison (Bison bison) female in snow, Riding Mountain National Park, Manitoba, Canada
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Donald M. Jones / American Bison (Bison bison) bull, National Bison Range, Montana
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Donald M. Jones / American Bison (Bison bison) with grass on horns, National Bison Range, Montana
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Donald M. Jones / American Bison (Bison bison) bull, National Bison Range, Montana
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Donald M. Jones / American Bison (Bison bison) bull, National Bison Range, Montana
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Jim Brandenburg / American Bison (Bison bison) herd on prairie with quartz, Blue Mounds State Park, Minnesota
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Matthias Breiter / American Bison (Bison bison) herd grazing, Grand Teton National Park, Wyoming
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Ingo Arndt / American Bison (Bison bison) herd, South Dakota
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Sean Crane / American Bison (Bison bison) mother and calf at sunrise, Yellowstone National Park, Wyoming
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Donald M. Jones / American Bison (Bison bison) bulls, National Bison Range, Moise, Montana
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Donald M. Jones / American Bison (Bison bison) bull, western Montana
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Sumio Harada / American Bison (Bison bison) free roaming wild herd along river, Yellowstone National Park, North America
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Tim Fitzharris / American Bison (Bison bison) herd grazing on shortgrass praire near Scoria Point, Theodore Roosevelt National Park, North Dakota
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Tim Fitzharris / American Bison (Bison bison), North America
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Tim Fitzharris / American Bison (Bison bison) herd grazing near Fountain Paint Pots, Yellowstone National Park, Wyoming
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Tim Fitzharris / American Bison (Bison bison) in winter, Yellowstone National Park, Wyoming
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Jim Brandenburg / American Bison (Bison bison) herd stampeding, South Dakota
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Shin Yoshino / American Bison (Bison bison) silhouetted at dawn, Yellowstone National Park, Wyoming
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Jim Brandenburg / American Bison (Bison bison) male, Blue Mounds State Park, Minnesota
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Shin Yoshino / American Bison (Bison bison) herd drinking from lake, Yellowstone National Park, Wyoming
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Shin Yoshino / American Bison (Bison bison) two males fighting, Yellowstone National Park, Wyoming
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Jim Brandenburg / American Bison (Bison bison) male and female, South Dakota
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Jim Brandenburg / American Bison (Bison bison) pair in blizzard, Minnesota
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Jim Brandenburg / Black-tailed Prairie Dog (Cynomys ludovicianus) in burrow with American Bison (Bison bison) and Ponderosa Pines (Pinus ponderosa), Wind Cave National Park, South Dakota
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Jim Brandenburg / American Bison (Bison bison) mother with nursing calf, South Dakota
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Jim Brandenburg / American Bison (Bison bison) herd of adults and calves on tallgrass prairie, South Dakota
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Jim Brandenburg / American Bison (Bison bison) herd stampeding, South Dakota
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Jim Brandenburg / American Bison (Bison bison) herd grazing on prairie at sunset, South Dakota
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Jim Brandenburg / American Bison (Bison bison) herd stampeding, South Dakota
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Jim Brandenburg / American Bison (Bison bison) male walking through tallgrass prairie, South Dakota
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Jim Brandenburg / American Bison (Bison bison) and snowmobiles, Yellowstone National Park, Wyoming
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Jim Brandenburg / American Bison (Bison bison) pair grazing on prairie under an anvil cloud, Nebraska
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Jim Brandenburg / American Bison (Bison bison) herd stampeding, South Dakota
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Jim Brandenburg / American Bison (Bison bison) herd stampeding, South Dakota
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Duncan Usher / European Bison (Bison bonasus) herd in snowy woodland, Sababurg, Hessen, Germany
