Dinosaurs and Prehistoric Animals:The Western Interior Seaway 80 Million Years Ago
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the Midwest of North America under water
Tylosaur - a huge 50 foot long sea serpent (mosasaur) and it's smaller cousins Halisaurus and Clidastes
Elasmosaurus - a huge long-necked plesiosaur
Archelon - a giant sea turtle similar to modern leatherbacks
Hesperornis and Baptornis - flightless aquatic birds
Quetzalcoatlus and the smaller but still very big pterosaurs
Pteranodon and Nyctosaurus
Ichthyornis a toothed gull-like bird