A free climber went viral, but not for the reason he’d hoped. Watch an urban climber get arrested on the side of skyscraper.

Scientists have described a new species of mountain pit viper, a venomous snake that inflates itself to appear scarier.

A trail camera in British Columbia captured a picturesque scene—a grizzly bear family hunting salmon in a river.

A new study lists the 10 safest national parks in the United States and the 10 most dangerous. Can you guess which one tops either list?

On Monday, a deer leapt through the front windshield of a bus in Rhode Island, shocking passengers. Watch it go down here.