Nyctosaurus

A flying reptile, had greatly elongated fourth – finger bones to support its seven –foot – wide membranous wings, and was better adapted to soaring than flapping flight. Although most of its bones were hollow and birdlike, Nyclosaurus was neither a bird nor a bird ancestor. In fact, it was competition that probably pushed Nyctosaurus and other flying reptiles to their long glide to extinction during the Cretaceous, some 70 million years ago.