Photo shows bighorn sheep's gravity-defying descent

Who's walking vertically down the side of a rocky cliffside? No, it's not a stuntman from the latest "James Bond" or a gravity-defying performer from Cirque du Soleil.

Instead, it's a bighorn sheep making a steep descent down a mountain in the National Elk Refuge in Jackson, Wyoming.

A photo of the impressive feat made the rounds on social media after it was posted to Twitter by the U.S. Department of Interior on Wednesday.

While bighorn sheep are known for their agility in traversing steep terrain, some Twitter users didn't believe the photo was real.

"Photoshopped!!!!," wrote user @TrackScotty in response to the post.

The Interior Department tweeted back with a series of four images showing the sheep's journey down the cliffside - no special effects or fakery involved, they insisted.