Grazing Bison, Wichita Mountains Wildlife Refuge, Oklahoma

Photograph by George F. Mobley

Stately American bison graze beneath gold-lined clouds in the Wichita Mountains Wildlife Refuge in Oklahoma. Established in 1905, the refuge now shelters roughly 600 bison. Excess animals are sold live at public auction every October.

(Photo shot on assignment for the National Geographic book The Great Southwest, 1980)