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Photographer's Note

Yellowstone National Park is well known for its large population of Bison that roam the grasslands. In winter the grass is covered by many feet of snow and conditions are extremely harsh. They use their large heads as snow ploughs to find food. They are also found near the thermal areas in winter.

Bison have been present in Yellowstone since prehistoric times. They are the largest mammals in North America and can be aggressive if approached. They weigh up to 1,800 pounds but are agile and can run fast.

This picture was taken close to the Madison River which runs freely in winter because it is fed with warm water from thermal activity.

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Additional Photos by Ann Jackman (annjackman) Gold Star Critiquer/Gold Note Writer [C: 1522 W: 0 N: 3658] (18155)
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