Reaching up to 800 pounds and 8 feet tall when standing, grizzly bears boast tremendous size and physical strength and have almost no natural enemies. Or just one — humans. But we’ve proved formidable ...

The smallest gray wolf subspecies in North America, the Mexican gray wolf is also one of the rarest and most imperiled mammals on the continent. The U.S. Fish and Wildlife Service (and its predecessor ...

The resilient mountain lion goes by many names: puma, cougar, panther, catamount and even “ghost cat.” Over the past century in California, it has survived habitat loss and government-sponsored ...

At the Center for Biological Diversity, we use path-breaking law, organizing and creative media to demand swift and just action from the federal government that reins in climate pollution from the ...

Read a statement from 30 scientists, doctors and public-health experts from Harvard, Cornell, Rutgers and other universities about the "overwhelming evidence for the toxic effects of lead in humans ...

The rare dancing grouse of the Southwest, called the lesser prairie chicken, is known for the males' elaborate calls and showy displays of reddish-orange air sacs while they perform mating dances on ...

In the forests of the Southwest, small trees dominate and comprise the vast majority of the fire risk to communities and the forest — in fact, approximately 90 percent of Southwest forest trees are ...