America's National Mammal, the American Bison - Yellowstone National Park, Wyoming

American Bison plowing through the deep snow to forage for buried food. - Yellowstone National Park, Wyoming

Bighorn Sheep - Yellowstone National Park

Pronghorn Antelope Doe - near Mammoth Hot Springs, Yellowstone National Park, Wyoming

Mountain Goat on colorful, precipitous terrain - Yellowstone National Park

Pair of Bighorn Sheep rams on snow-topped hill - Yellowstone National Park, Wyoming

Herd of bison in the midst of snowfall - Lamar Valley, Yellowstone National Park, Wyoming

Bighorn Sheep - Yellowstone National Park, Wyoming

Pronghorn Antelope