Prehistoric lizards could sprint on two legs

Fossilized footprints provide new insight on ancient lizard behavior Fossilized lizard footprints dating back to the Cretaceous indicate the little scaly beasts could get up and run on two legs. Illustration by Chuang Zhao 110 million years ago, in the late Cretaceous, lizards schlepped through muddy lagoons in what we now call South Korea.