Happy National Bison Day! In 1905, leaders of WCS helped to form the American Bison Society. Their work prevented the extinction of this iconic species by establishing several small herds — sometimes with animals from the Bronx Zoo — in widely separated preserves across the country. Shown here are bison sent from the Bronx Zoo to Oklahoma’s Wichita Mountains Wildlife Refuge in 1907. National Bison Day, which is celebrated on the first Saturday in November, commemorates the ecological, cultural, historical, and economic contribution of the American bison to the US.