An amazing scene played out recently at Wyoming's National Elk Refuge.

In a spectacular standoff that lasted for more than an hour, five coyotes cornered two juvenile mountain lions, who took up refuge high on a buck and rail fence.

The coyotes let the cats know they weren’t welcome in the area. The coyotes become more aggressive as one of the mountain lions moves down the fence-line.

Photos by Lori Iverson / USFWS
Photos by Lori Iverson / USFWS
Photos by Lori Iverson / USFWS

The incredible photoset has since gone viral. Check out more of the photos by Lori Iverson on the USFWS flickr page.