A wild bison and her eight-day-old calf are seen at the Rocky Mountain Arsenal National Wildlife Refuge...
A wild bison and her eight-day-old calf are seen at the Rocky Mountain Arsenal National Wildlife Refuge outside Denver August 6, 2009. The bison were reintroduced to the area in 2007 and have had several calves since then. REUTERS/U.S. Forest Service (UNITED STATES ANIMALS)