A Yellowstone wolf showed its more playful side Monday, somehow removing and carrying off a sign put up warning tourists ...

Add Yahoo as a preferred source to see more of our stories on Google. A grizzly bear’s size and strength make it a dominant force in the wild, but a coordinated wolf pack presents a serious challenge.

A hungry wolf in Yellowstone sits and waits for an injured elk to succumb to exhaustion. But time isn't on his side - if he waits too long, he'll lose his prey to other wolves. #EpicYellowstone ...