Bison scratching an itch beside the Yellowstone River
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Bison, Geyser Steaming 011204 Monument Geyser Basin, Yellowstone National Park 0115.jpg
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Bison refuelling in Lamar River, Lamar Valley Yellowstone National Park
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0431.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0432.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0433.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0435.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0436.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0438.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0440.jpg
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