Did you know?

Researchers have found several of these colossal burrows called palaeoburrows across South America. They were actually dug by an extinct species of giant ground sloth around 8,000 to 10,000 years ago, and you can actually see the claw marks of the massive ancient creatures on the surface of the tunnels.
Picture Palaeoburrows are Huge Tunnels Dug by Extinct Species of Giant Ground Sloth

Heinrich Frank/Discovermagazine.com