Article Photos: 29 species may need federal protection 1/1

This Jan. 26, 1998 file photo shows a Mexican gray wolf moving through his new home, a third of an acre pen after being released from a cage in Hannagan Meadows, Ariz. Three conservation groups filed petitions this week asking the U.S. Fish and Wildlife Service to list the Mexican gray wolf on the federal  endangered  species list separate from other gray wolves in North America. They say that would force the agency to pay more attention to the animal. (AP Photo/Jeff Robbins, File)