The Los Angeles Times has reported that although Wyoming spent nearly a decade protesting the federal government's efforts to reintroduce gray wolves to the region, and the animals were eventually removed from the endangered species list, the U.S. Fish and Wildlife Service is now attempting to relist the gray wolf. You can read the article here. See the FWS's press release about the wolf's reinstatement.
The FWS's website contains various documents illustrating the changing status of the gray wolf. In early 2004 the agency described steps necessary for delisting the gray wolf. In 2006 it issued this press release announcing that the wolf would remain on the endangered species list. This year FWS issued this 33-page report about the status, distribution, and management of wolves in Wyoming and Yellowstone National Park.
For additional resources on endangered species, see our guide on endangered species.