California might want more debris and toxin removal than the federal government says is necessary. Who should pay?

Rocky Mountain National Park is studying the impacts a booming moose population is having on its ailing willows and wetlands.

Upper Peninsula visitors are asked to keep a safe distance away from wild moose while tracking devices are fitted.

The study in the western U.P. will try to find out why the state's mainland moose population has not grown faster.

Two rare black wolves, likely siblings, were spotted on camera crossing a stream in a Polish forest, a conservation ...