JOHN CONWAY / SCIENCE PHOTO LIBRARY JOHN CONWAY / SCIENCE PHOTO LIBRARY
Pterosaurs (Sinopterus dongi) walking on a beach, artwork. Pterosaurs, also known as pterodactyls, are an extinct group of flying reptiles that were the first vertebrates to evolve powered flight. S. dongi was a small pterosaur that lived during the Early Cretaceous, 125-121 million years ago. It had a very large skull in proportion to the body, a birdlike pointed beak, and long bony crest. S. dongi had a wingspan of 1.2 metres.Fossil trackways reveal that pterosaurs were able to walk on the ground using all four limbs.
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