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Giant sloths in South America excavated ENORMOUS tunnels during the Pleistocene. These remarkable megaburrows preserve the claw marks from the beasts that engineered them. More details and image credits here discovermagazine.com/planet-earth/g… 
“Frank went back a few weeks later and crawled inside. It was a single shaft, about 15 feet long; at its end, while on his back, he found what looked like claw marks all over the ceiling.”
“Unable to identify any natural geological explanation for the cave’s existence, he eventually concluded that it was a “paleoburrow,” dug, he believes, by an extinct species of giant ground sloth.”
