Marine Corps Wildlife Biologist Searches for Least Bell's Vireo

Colin Lee, wildlife biologist with the Marine Corps Base Camp Pendleton Game Warden’s Office, searches for the endangered Least Bell’s Vireo at the Santa Margarita River on Camp Pendleton, Calif., May 16 2018. The Game Warden's Office began improving natural habitats and reducing the threat of predator birds in 1986. Since then, population has increased from 291 known nesting territories to 2,968. (U.S. Marine Corps photo by Lance Cpl. Drake Nickels/Released)