Ancient Crocodile May Have Been a Biped


Fossil Footprints Suggest Ancient Crocodile Walked on Two Legs

by Theresa Machemer/

A prehistoric ancestor of the crocodile may have walked on two legs, according to a paper published on June 11 in Scientific Reports.

The new research focuses on large footprints in the Jinju rock formation in South Korea. A 2012 investigation of large, poorly defined footprints suggested that they might have come from a flying reptile called a pterosaur, but clearer footprints discovered recently changed the story. The new footprints capture the shape of the ancient creature’s toes and the texture of its skin, both of which are classically crocodilian. But the footprints had another curious feature: there were only prints from back feet.

To paleontologist Martin Lockley, who specializes in trace fossils at the University of Colorado Denver, the lack of front footprints probably means that the ancient crocodile walked only on its back legs. “We have dozens of these things, and not one sign of a front footprint, so we’re pretty convinced,” Lockley tells Science News.

The tracks are between seven and ten inches long and the animal that left them was probably similar in size to modern crocodiles. It lived during the early Cretaceous period, about 106-million years ago. (The late Cretaceous saw the lifetimes of several dinosaur more:


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