The push to revive extinct animals is accelerating, but scientists disagree about whether gene-edited species count as true "de-extinction." ...

When the Chernobyl nuclear disaster happened on April 26, 1986, the region became one of the most heavily contaminated areas on the planet. A 1,000-square-mile area surrounding the doomed nuclear ...

Mexican gray wolves continue to be one of the most controversial conservation issues in Arizona and across the region.

For the first time since their species was reintroduced in Colorado, a gray wolf has been tracked into Pueblo County.

Arizona wildlife managers say consistent growth in the Mexican gray wolf population could trigger the species' downlisting ...

The U.S. Fish and Wildlife Service and the Department of the Interior are requesting comments with regard to the management of the Colorado gray wolf program, grizzly bears and Mexican wolves. The ...

For the first time in a century, biologists have documented a gray wolf in Los Angeles County over the weekend, a sign that these predators that were eliminated from the state by hunters are ...

Another wolf in the King Mountain pack has died, Colorado Parks and Wildlife announced Friday.

Gray wolves, a species that has long been vilified and admired, will no longer receive federal protections under the Endangered Species Act in the Lower 48 U.S. states, the Trump administration ...

The Trump administration said this week that it would not develop a new recovery plan for gray wolves, a move environmentalists say could be a first step toward removing endangered species protections ...