Mariana fruit bats interact with each other at the Guam National Wildlife Refuge on Ritidian Point, Guam, May 20, 2013. The Mariana fruit bat, which dwells on Guam and the Commonwealth of the Northern Mariana Islands, is currently listed as a threatened species, though it has fluctuated between endangered and threatened in the past. (U.S. Air Force photo by Staff Sgt. Melissa B. White/Released)