Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0441.jpg
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Bison, 2 head butting 021612 Tower Junction, Yellowstone NP #0443.jpg
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Bison rests at the Sulphur Caldron in Yellowstone National Park
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Bison in the Mud Volcano area of Yellowstone National Park
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Bison grazing in the Lamar Valley of Yellowstone National Park
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Bison sleeping near the Sulphur Caldron in Yellowstone National Park
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Bison are not worried about traffic in Yellowstone
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Bison near a steaming spring along the Yellowstone River in Yellowstone NP
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Bison, Bull taking dust bath 080904 Hayden Valley, Yellowstone Natl Park 0195.jpg
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Bison family grazes in the Lamar Valley in Yellowstone NP
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