Nestling Least Bell's Vireos (Vireo bellii pusillus)

Detailed Description
The Marine Corps Base Camp Pendleton hosts 18 endangered species, with the Least Bells Vireo is one of which is more likely to create its habitat on the installation compared to surrounding rural areas due limited resources and human population. Nationwide more than 300 federally listed threatened or endangered species reside on military installations. (U.S. Marine Corps photo by Lance Cpl. Drake Nickels)
Sources/Usage
Public Domain.