Necedah National Wildlife Refuge, a 43,696-acre protected area in northern Juneau County, Wisconsin, was established in 1939 within the Great Central Wisconsin Swamp, the state’s largest wetland bog. Its wetlands, forests, and rare oak barrens provide habitat for migratory waterfowl and uncommon species including the Karner blue butterfly, massasauga rattlesnake, Blanding’s turtle, and wolves. It is especially significant as the northern nesting site used to reintroduce an eastern population of endangered whooping cranes. Beginning in 2001, chicks were raised there and taught a migration route to Florida with ultra-light aircraft, helping create a migrating eastern population that reached as many as 105 birds by 2010.