I read a passage from an LSAT:
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.
Could someone explain and parse out this weird subject "the earliest dinosaurs to fly"? Is it a reduced form?
I found this particularly bizarre when reading "flying dinosaur" at the end. It seems the test maker distinguishes between "flying dinosaur" and "dinosaur to fly".