150606-N-HP195-777 (June 6, 2015) SAN CLEMENTE ISLAND, Calif. - Navy biologists and natural resource managers present Secretary of the Navy Ray Mabus with a "rat whacker" during his visit to San Clemente Island, June 6. The device uses a novel means of trapping and incapacitating invasive rat species without poison so that the rats can be made available as food to the local population of island foxes. (U.S. Navy photo by Mass Communication Specialist 1st Class Christopher Okula/RELEASED)