Paleoborrows: tunnels left by giant sloths or armadillos

Paleoburrows are the vernacular architecture of extinct megafauna. With enough headroom for the average-height human, the giant sloth tunnels of Brazil speak to the industry of their creators.

Once Professor Frank got a taste of one tunnel, he went looking for more and was shocked to see just how many were laying in plain sight.

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from Boing Boing https://ift.tt/3J58Vel