James Dolan, 733rd Civil Engineer Division environmental flight conservationist, maneuvers his boat through a small tributary of the James River in search of nutria signs at Fort Eustis, Va., June 4, 2013. Nutria are semi-aquatic creatures, so Dolan must place curiosity traps in locations reachable only by boat. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)