Elk that survived decimation in the Greater Yellowstone Ecosystem at the turn of the 20th century have been used as feedstock to rebuild elk herds across the West. The Jackson Hole Herd is among several famous herds in the region numbering more than 11%2C000 strong. On any given winter%2C 80 percent of those wapiti get artificial nourishment at the National Elk Refuge. Photo courtesy US Fish and Wildlife Service