Bison, snowplowing 021508 Round Prairie, Yellowstone Natl Park #0256.jpg
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Bison, snowplowing 021508 Round Prairie, Yellowstone Natl Park #0276.jpg
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Bison 021708 Soda Butte Valley, Yellowstone Natl Park #0593.jpg
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Bison, snowing 021712 Lamar Valley, Yellowstone NP #0292.jpg
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Bison, snowing 021712 Lamar Valley, Yellowstone NP #0297.jpg
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Bison on an island in Yellowstone River
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Bison in the valley of the Yellowstone
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Bison, Calf, Cow 080904 Hayden Valley, Yellowstone Natl Park 0153.jpg
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Bison, Snow Covered 011204 Madison River, Yellowstone National Park 0004.jpg
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Bison, Snow Covered 011204 Madison River, Yellowstone National Park 0056.jpg
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