Pteranodon

The Pteranodon is a very massive flying reptile. When it spread its wings, it could reach from the front to the back of a school bus. Just imagine something that big flying around. It didn't have feathers, but rather had a basal type of integument along the same lineage that feathers evolved upon called pycnofibers. Pycnofibers were very hair-like in appearance and, like hair, were made of keratin.

Members of the order Pterosauria lived through much of the Mesozoic, some species of pterosaurs with wingspans close to 11 m (36 feet). Pteranodon, as you can tell by the translation of its name, had no teeth. It probably used the long crest on the back of its head to help it steer while flying. There is still some debate about whether these reptiles could actually fly or if they were primarily gliders, but the consensus seems to be that they could take off with little or no wind. It also did not have teeth, something portrayed (it having teeth) in the movie.

Their diet was probably fish and scavenged remains of dead animals. Quite a few Pteranodon skeletons have been found in Kansas in the central part of the U.S. This would have been the shore of a shallow sea when these creatures were alive, supporting the theory that they were fish eaters.

More real-life information: Pteranodon at Wikipedia.

Vocalizations
Pteranodons were given a wide array of calls and vocalizations in Jurassic Turok, as well as an eerie, bird-like scream at the end of the series. The creators used large bird sounds (including giant petrels) for the Pteranodons. Voice actor Frank Welker also lent his voice for some of the vocals.