A three-legged lion and his brother swam farther than any other lion on record, and they did it despite all the crocs and hippos. But why?

Did a mountain lion attack a 19-year-old dirt biker last week? Officials say it was a house cat, but the teen says no way.

Have you ever seen a mountain lion on an iceberg? A wildlife photographer took some stunning photos of a cougar in an unlikely place.

A trail camera captured video of a happy moose frolicking in a stream. The moose seems to be having the best time.

A whole family of mountain lions cruised through a backyard in California. Watch the home-security camera footage here.

An ultrarunner did not expect his 50-mile run into Yosemite Valley to end with an unwanted bear hug. Here’s what happened.

In a battle of wolf pup vs. squirrel, the pup learns a valuable lesson. Sometimes, lunch bites back. Watch it here.

When bears find stuffed teddy bears in the forest, it’s time to play. Check out this trail-cam footage from Montana.

The magnificent tree frog isn’t supposed to be blue. But this one is. Meet the rare blue frog that might be the only one of its kind on Earth.

Scientists spotted a newborn pygmy blue whale calf swimming with its mother and captured some beautiful photographs.