FILE - Mustangs recently captured on federal rangeland roam a corral at the U.S. Bureau of Land Management's holding facility north of Reno, in Palomino, Nev., on Sept. 4, 2013. Wild horse advocates are accusing U.S. land managers of violating environmental and animal protection laws by approving plans for the nation's largest holding facility for thousands of mustangs captured on public lands in 10 western states. (AP Photo/Scott Sonner, File)