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.
Pleistocene megafauna
During the American megafaunal extinction event around 12,700 years ago, 90 genera of mammals weighing over 44 kilograms became extinct. The Late Pleistocene fauna in North America included giant sloths, short-faced bears, several species of tapirs, peccaries (including the long nosed and flat-headed peccaries), the American lion, giant tortoises, "Miracinonyx" ("American cheetahs", not true cheetahs), saber-toothed cats like "Smilodon" and the scimitar cat, "Homotherium", dire wolves, saiga, camelids such as two species of now extinct llamas and "Camelops", at least two species of bison, the stag-moose, the shrub-ox and Harlan's muskox, 14 species of pronghorn (of which 13 are now extinct), horses, mammoths and mastodons, the beautiful armadillo and the giant armadillo-like "Glyptotherium", and giant beavers, as well as birds like giant condors and other teratorns. The nine-foot sabertooth salmon lived at the time as well. In contrast, today the largest North American land animal is the American bison.