The last, and perhaps the most interesting, of the doomed monsters of the Mesozoic was the pterosaur, or "flying reptile."
"The Story of Evolution"
Joseph McCabe
We have seen that there were leaping reptiles with hollow bones, and although the intermediate forms are missing, there is little doubt that the pterosaur developed from one or more of these leaping Deinosaurs.
"The Story of Evolution"
Joseph McCabe