Lower Yellowstone Falls
Lower Yellowstone Falls seems to glow in the first light of day as it empties into the Grand Canyon of Yellowstone.

Grand Canyon of Yellowstone
The Grand Canyon of Yellowstone is filled with mist from Lower Yellowstone Falls, backlit by the morning sun.

Fiery Tree
The setting sun dramatically lights the clouds that frame this pine tree in the Grand Canyon of Yellowstone National Park.

Black Bear and Cub
A black bear cub (Ursus americanus) returns to its mother after climbing a tree in Yellowstone National Park.

Bison
Four American Bison (Bison bison) - a pair of mothers and their babies - rest in an open field in Yellowstone National Park, Wyoming. Bison are commonly referred to as buffalo, although true buffalo are natively only to Africa and Asia.

Trumpeter Swan
A trumpeter swan (Cygnus buccinator) feeds on the grasses in a Yellowstone National Park pond.

Coyote
A coyote (Canis latrans) is on the prowl on a hillside in Yellowstone National Park, Wyoming.

Columbian Ground Squirrel
A Columbian ground squirrel (Spermophilus columbianus) surveys the scene at Yellowstone National Park, Wyoming.

American White Pelicans
American White Pelicans (Pelecanus erythrorhynchos) preen themselves at the edge of Yellowstone River.

Orange Spring Mound
The unusual geology of Yellowstone National Park results in the formation of a huge spring made up of orange-colored deposits.

Blue Funnel Spring
Steam from the Blue Funnel Spring in Yellowstone National Park rises just after sunset. Part of Lake Yellowstone is visible in the background.

Steaming Creek
The steaming runoff from the Terrace Springs zigzags across a meadow in Yellowstone National Park.

Gardner River
This portion of the Gardner River forms an 'S' as it cuts its way through a valley in Yellowstone National Park.

Gibbon River
A stormy fall sunrise reflects in the waters of the Gibbon River in Yellowstone National Park.

Yellowstone River
A late spring sunset lights up the sky and reflects in the waters of the Yellowstone River in Yellowstone National Park, Wyoming.

Sunrise, Norris Basin
Steam from the dozens of geysers in the Norris Basin of Yellowstone National Park rises into the sky at sunrise.

Norris Basin and Gallatin Mountains
Rising steam from the geysers of Norris Basin in Yellowstone National Park frames the Gallatin Mountains.

Cave Falls, Yellowstone National Park, Wyoming
Cave Falls, located in the southwest portion of Yellowstone National Park in Wyoming, may only be 20 feet tall, but it stretches 250 feet across the Falls River. Cave Falls, the widest waterfall in Yellowstone, is named for a 50-foot cave at its base. While Cave Falls is in Wyoming, it can only be accessed from a road in Idaho.