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.
Creodonta
Creodonts ranged in size from the size of a small cat to the 800 kg "Sarkastodon". The larger sized animals, however, were not known until late in the Paleocene with the radiation of the oxyaenids, such as the puma-sized "Dipsalidictis" and the probably bone-crushing scavenger "Dipsalodon".