Pteranodons were a group of flying reptiles. They had no teeth and were tail-less generally (if the very short tail is disregarded). The Pteranodons lived during the late Cretaceous Period. They had a significant growth rate, with wing spreads of 25 feet or more! It is believed that Pteranodons grew even larger towards the late Cretaceous Period.

The first specimens were discovered in North America, in 1870. They were found in the Smoky Hill Chalk in the west of Kansas, by O.C.Marsh, in the form of fragments of wing bones much larger than the pterodactyl remains previously discovered in Europe. The Pteranodons were highly developed special species of pterosaurs.

The flying Pteranodons did not have tails or teeth like their predecessors, the pterosaurs, who roamed the earth (mainly Europe) during the Jurassic era and were usually of much larger size. The wing membranes of the Pteranodons were no longer in connection with the lower legs.

These flying reptiles were presumably warm blooded and had a narrow shield of hair all over their bodies. They spent most of their time flying over the ocean's waters hunting for their preys. They used to feed on fish and other marine animals and played a role in the Cretaceous Inland Sea, pretty much like other sea birds such as nowadays' albatross and pelican!