Opinion: A grizzly bear ecosystem without grizzly bears cannot be declared recovered and delisted no matter what Congress says.

Photos courtesy of Tobias Cortner and Larry Gorcheski. Tobias Cortner has been picking up sheds his whole life. Growing up in ...

Extreme heat is intensifying in Arizona, as temperatures are warming earlier in the spring and persisting later into the fall. Heat waves are increasing in temperature, frequency and duration, pushing ...

Annual meadow closures have gone into place in Rocky Mountain National Park. The closures are in advance of the fall mating season of elk, also known as the elk rut.