Pteranodon
Pteranodon (; from Greek πτερόν ( pteron, "wing") and ἀνόδων (anodon, "toothless") is a genus of pterosaur that included some of the largest known flying reptiles, with wingspans over 8 meters (26 feet). They lived during the late Cretaceous geological period of North America in present-day Kansas, Alabama, Nebraska, Wyoming, and South Dakota. More fossil specimens of "Pteranodon" have been found than any other pterosaur, with about 1,200 specimens known to science, many of them well preserved with nearly complete skulls and articulated skeletons. It was an important part of the animal community in the Western Interior Seaway.
Walking with Dinosaurs
"Tropeognathus" is depicted as far larger than it actually was. In the book based on the series, it was claimed that several large bone fragments from the Romualdo Formation of Brazil possibly indicate that "Tropeognathus" may have had a wingspan reaching almost 12 metres and a weight of a hundred kilograms, making it one of the largest known pterosaurs. However, these specimens have not been formally described. The largest definite "Tropeognathus" specimens known measure 6 metres in wingspan. The specimens which the producers of the program used to justify such a large size estimate are currently undescribed, and are being studied by Dave Martill and David Unwin. Unwin stated that he does not believe this highest estimate is likely, and that the producers likely chose the highest possible estimate because it was more "spectacular." However, no other Early Cretaceous pterosaurs reached its size. Similarly, "Liopleurodon" is depicted as being 25 m (82 ft) long in the series, whereas the adult size known to have been reached by "Liopleurodon" is around 7 m (23 ft).