Scientist: It seems likely that the earliest dinosaurs to fly did so by gliding out of trees rather than, as some scientists think, by lifting off the ground from a running start. Animals gliding from trees are able to fly with very simple wings. Such wings represent evolutionary middle stages toward developing the large wings that we associate with flying dinosaurs.
 Early flying dinosaurs lived at a time when their most dangerous predators could not climb trees strengthens the scientist's argument EXCEPT.