Fossil footprints show some crocodile ancestors walked on two legs

Puzzling nearby tracks were likely also made by a bipedal croc ancestor, not a giant pterosaur

illustration of crocodile ancestors walking on two legs

About 106 million years ago, a large crocodile ancestor (shown here in an artist’s conception) walked on two legs in what is now South Korea, leaving behind a series of footprint impressions now preserved in the rock.

Anthony Romilio/The University of Queensland

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