A federal agency “mistakenly” killed an endangered and possibly pregnant Mexican gray wolf in Arizona, officials said.

The accidental killing of a Mexican gray wolf in Greenlee County has advocacy groups calling for transparency and ...

The de-extinction of dire wolves has proven that science can. As they mull the return of dodos and mammoths next, the question remains: should they?

Scientists say the Trump administration’s embrace of de-extinction won’t help endangered species like the Great Lakes gray ...

Over the last month, two of Colorado’s latest gray wolf transplants were killed after crossing the border into Wyoming.

The dramatic moment, recorded by photographer Julie Argyle, illustrates the problems apex predators endure, even when they combine forces.

Earlier this month, a biotechnology company announced it had genetically engineered three gray wolf pups to have white hair, more muscular jaws and a larger build — characteristics of the dire wolf, a ...