A Mexican gray wolf leaves cover at New Mexico's Sevilleta National Wildlife Refuge.

(AP Photo/U.S. Fish and Wildlife Service, Jim Clark, File)

Posted 5:30 a.m. | Updated 8 a.m.

The Colorado Parks and Wildlife Commission says it opposes any possible move by the federal government to introduce endangered Mexican gray wolves to the state, arguing they aren't native to Colorado and would threaten livestock and big game animals.

Commissioners approved a resolution Wednesday saying they're against a formal effort to establish a wolf population but said they wouldn't object if wolves migrated to Colorado on their own.

The U.S. Fish and Wildlife Service is compiling a recovery plan for Mexican gray wolves. The agency says it's made no decision to put them in Colorado, but state officials say federal planners are considering it.

Federal officials say they're discussing the future of the wolves with Colorado, Utah, New Mexico and Arizona. About 100 live in the wild in New Mexico and Arizona.

Wildlife advocates are planning news conferences and rallies Thursday in Utah, Colorado, New Mexico and Arizona to call out state leaders for trying to keep their lands out of a potential recovery zone for the wolf.

Kirk Robinson of Western Wildlife Conservancy says government leaders in the four Western states are spreading inaccuracies.

Utah's wildlife board recently sent a letter to the Department of the Interior arguing scientific research shows wolves have never lived north of Interstate 40, which runs through New Mexico and Arizona. The board said trying to lure the wolves to Utah would harm the species because they would hybridize with Northern gray wolves.

Governors from the four states sent a similar letter in November.