The Pryor Mountains, named after Sergeant Nathaniel Pryor of the Lewis and Clark Expedition, is home to the Pryor Mountain Wild Horse Range. In 1968, 31,000 acres in the Pryor Mountains was set aside as a public range for the wild horses, the first of its kind in the nation.

For more than a century, the Pryor Mountains have been home to free-roaming, genetically unique bands of wild horses linked to the Spanish Mustangs brought to the United States by the Spanish conquistadors. The heard size of about 120-140 is managed by the Bureau of Land Management.