ADVANCE FOR WEEKEND, SEPT. 29 AND THEREAFTER - In this photo taken Friday, Sept. 21, 2012, Roy Averill-Murray, left, who oversees Desert Tortoise receovery for the U.S. Fish and Wildlife Service, checks his G.P.S. coordinates while hiking to release desert tortoises at the Nevada National Security Site in Mercury, Nev. The project was designed so that the federally protected reptiles could be observed after being reintroducted to desert habitat.  