In the age of the dinosaur the skies were dominated by huge reptiles - the pterosaurs. But what do we know of their appearance and habits?

David Attenborough searches among living reptiles, bats and birds to discover the answers. He introduces us to a lifelike replica pterosaur that can hop and jump, another with an 11ft wing span that soars over the English coast, and the largest creature ever to take to the air.