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Bison inhabit the North and South Units of the park.
A bull bison walking along the South Unit's Scenic Loop Drive.
Young Bison Calf
Calves are orange in color when they are born. They typically turn brown by their first winter.
Feral Horses in the South Unit of Theodore Roosevelt National Park.
Feral horses, also termed "wild horses," inhabit the South Unit of Theodore Roosevelt National Park.
A desert cottontail seeks the shade of a piece of petrified wood.
Mule deer are widespread in the badlands.
Badgers are one of the prairie dog's many predators, aggressively digging into their prey's den.
Mule Deer Buck
A mule deer buck in velvet.
Prairie dogs communicate with each other by a number of sounds called "barks" or "yelps."
Mule Deer Fawn
A mule deer fawn on a cold winter day.
A small group of elk on the Ridgeline Nature Trail
Coyote and Horses
A coyote patrols through a prairie dog town while feral horses graze nearby.
The North American Pronghorn is the fastest land animal over a long distance.
If you are lucky, you might spot a porcupine sitting in a cottonwood tree or ambling along the ground.
Prairie dogs clip plant material close to the ground as they feed. If they don't keep up with their "yard work," it is more difficult for prairie dogs to spot and avoid predators.
Theodore Roosevelt called the elk a "stately and splendid deer, the lordliest of its kind throughout the world..."
The least chipmunk is the smallest type of chipmunk in North America.
Bighorn sheep from British Columbia were reintroduced to the North Unit of Theodore Roosevelt National Park in 1996. Historically, this area was home to the now-extinct Audubon's bighorn sheep.
The park maintains a small group of longhorn steers in the North Unit as a historic demonstration herd. Steers of this type were moved Texas to new ranges on the Northern Great Plains via the Long X Trail in the late 1800s.