American Bison (Bison bison), Little Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Black Opal Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Sapphire Pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Creek and pool in Biscuit Basin, Yellowstone National Park, Wyoming.

Pair of American Bison bulls (Bison bison) walking through the 'Bobby Socks' trees in the Firehole River Valley of Yellowstone National Park; Wyoming, United States of America

American Bison bull (Bison bison) plowing through deep snow in the Firehole River Valley, Yellowstone National Park; Wyoming, United States of America