野牛，Wichita山野生动物保护区，俄克拉荷马州（摄影：George F. Mobley）

在俄克拉荷马州Wichita 野生动物保护区，祥云下，威猛的美洲野牛在吃草。保护区建于1905年，野牛数量如今为600头左右。多出的部分一般在每年10月公开拍卖。

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)