Article Photos: New wildlife drive at former Colo. Superfund site 3/5

  This undated image supplied by the U.S. Fish and Wildlife Service shows bison at the Rocky Mountain Arsenal National Wildlife Refuge in Commerce City, Colo., with the Denver city skyline in the distance. The park, which opens a nine-mile do-it-yourself Wildlife Drive Oct. 13, was built on a former Superfund site just outside of Denver. (AP Photo/U.S. Fish and Wildlife Service, Walter Derr)