How a prehistoric predator took to the skies

Is that a bird in the sky? A plane? No, it's a pterosaur. Kate Thomas meets Professor Matthew Wilkinson, who built a life-size model to find out how this prehistoric predator ever got off the ground.  A Pterosaurs existed from the Triassic period, 220 million years ago, to the end of the Cretaceous period, 65 million years ago, when South America pulled away from Africa and the South Atlantic was formed. They are among the least understood of all the extinct reptiles that once spe...