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Thalassocnus natans is a species of sloth that lived during the late Miocene (~6mya) on what is now the coast of Peru and was a fairly common species in its time (McDonald and de Muizon 2002). It belongs to the family Nothrotheriidae. It was a unique sloth, in that it lived in and around the ocean. Based on the abrasive markings left by sand on its teeth, we know that T. natans lived mostly on land and fed on sea grass that was washed up or made short forays into the surf to find food. It was an early species in a group of sloths that now consists of four other sister species that evolved at different times from the late Miocene to the early Pliocene (~8 to 2 mya).