The tiger salamander, pictured here, April 10, 2012, at Travis Air Force Base, Calif., depends on vernal pools for reproduction, its habitat is limited to the vicinity of large, fishless vernal pools or similar water bodies. It occurs at elevations up to 1,000 meters (3,200 feet). Adults migrate at night from upland habitats to aquatic breeding sites during the first major rainfall events of fall and early winter and return to upland habitats after breeding. (U.S. Air Force photo/Heide Couch)