Bison rests next to a steaming pool across the Yellowstone River from the Mud Volcano area of Yellowstone National Park
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Bison on a ridge above the Lamar Valley in Yellowstone National Park
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Bison with the Lamar Valley as a backdrop in Yellowstone National Park
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Bison climbing a hill in the Lamar Valley of Yellowstone
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Bison bull approaches a female during the ‘rut’ in Yellowstone NP
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Bison heading toward the hills of the Lamar Valley in Yellowstone National Park
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Bison keeping an eye on things in the Lamar Valley of Yellowstone National Park
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Bison rests near a crater of boiling mud at the Sulphur Caldron in Yellowstone National Park
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Bison with no place in particular to go holding up traffic in the Hayden Valley of Yellowstone National Park
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Yellowstone Bison
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