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.
Barosaurus
"Barosaurus" was an enormous animal, with some adults measuring more than 26 meters (85 feet) in length and weighing more than 20 metric tons (22 short tons). There are some indications of even larger individuals, probably over 50 meters long and with a mass around 100 tonnes making it possibly the largest known dinosaur. "Barosaurus" was differently proportioned than its close relative "Diplodocus", with a longer neck and shorter tail, but was about the same length overall. It was longer than "Apatosaurus", but its skeleton was less robust.