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.
Spinosaurus
"Spinosaurus" was among the largest of all known carnivorous dinosaurs, nearly as large as or even larger than "Tyrannosaurus", "Giganotosaurus" and "Carcharodontosaurus". Estimates published in 2005, 2007, and 2008 suggested that it was between in length and in weight. New estimates published in 2014 and 2018 based on a more complete specimen, supported the earlier research, finding that "Spinosaurus" could reach lengths of . The latest estimates suggest a weight of . The skull of "Spinosaurus" was long and narrow, similar to that of a modern crocodilian. "Spinosaurus" is known to have eaten fish, and most scientists believe that it hunted both terrestrial and aquatic prey; evidence suggests that it lived both on land and in water as a modern crocodilian does. The distinctive spines of "Spinosaurus", which were long extensions of the vertebrae, grew to at least long and were likely to have had skin connecting them, forming a sail-like structure, although some authors have suggested that the spines were covered in fat and formed a hump. Multiple functions have been put forward for this structure, including thermoregulation and display.