FILE - In this undated file photo provided by the U.S. Fish and Wildlife Service, a Mexican gray wolf leaves cover at the Sevilleta National Wildlife Refuge, Socorro County, N.M. U.S. wildlife managers failed to adopt a recovery plan for the endangered Mexican gray wolf that would protect against illegal killings and the consequences of inbreeding, according to a lawsuit filed Tuesday, Jan. 30, 2018 by environmentalists. (Jim Clark/U.S. Fish and Wildlife Service via AP, File)
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