A hiker had a frightening encounter with a mountain lion on the Gridley Trail, a trail near Ojai, California. Watch here.

Grand Canyon National Park announced a hiker fatality on the South Kaibab Trail. Park officials infer a heat-related illness was to blame.

Nearly 200 million people have watched a viral video showing an insane chase between a hammerhead shark and a stingray. See it here.

Footage of rare huemul deer in Patagonia has scientists excited, because the group represents a new subpopulation of the species. Watch here.

A red fox kit is having a good time in a video shared by the U.S. Fish and Wildlife Service . . . but what exactly is it playing with?