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Description
Size comparison of large animals that lived in North America between 77 million years ago and 65 million years ago.
Upper row: Quetzalcoatlus northropi (one of the largest known pterosaurs), Chasmosaurus russelli (medium-sized ceratopsian with armored skin), Torosaurus latus (large ceratopsian with enormous neck frill) and Edmontosaurus regalis (huge, crest-less hadrosaur).
Middle row: Euoplocephalus tutus (large, heavy armored ankylosaur), Montanoceratops cerorhynchos (horned leptoceratopsid), Anatalavis rex (primitive waterfowl related to magpie goose) and Pachyrhinosaurus lakustai (large, bizzare ceratopsian with massive bone boss instead of nasal horn).
Lower row: Centrosaurus apertus (medium-sized ceratopsian with single nose horn), Lambeosaurus laticaudus (giant hadrosaur with distinctive head crest), Daspletosaurus torosus (large theropod ancestral to Tyrannosaurus), Stygimoloch spinifer (horned pachycephalosaur) and Bambiraptor feinbergi (small, bird-like dromaeosaur).

Description
Size comparison of large animals that lived in North America between 77 million years ago and 65 million years ago.
Upper row: Quetzalcoatlus northropi (one of the largest known pterosaurs), Chasmosaurus russelli (medium-sized ceratopsian with armored skin), Torosaurus latus (large ceratopsian with enormous neck frill) and Edmontosaurus regalis (huge, crest-less hadrosaur).
Middle row: Euoplocephalus tutus (large, heavy armored ankylosaur), Montanoceratops cerorhynchos (horned leptoceratopsid), Anatalavis rex (primitive waterfowl related to magpie goose) and Pachyrhinosaurus lakustai (large, bizzare ceratopsian with massive bone boss instead of nasal horn).
Lower row: Centrosaurus apertus (medium-sized ceratopsian with single nose horn), Lambeosaurus laticaudus (giant hadrosaur with distinctive head crest), Daspletosaurus torosus (large theropod ancestral to Tyrannosaurus), Stygimoloch spinifer (horned pachycephalosaur) and Bambiraptor feinbergi (small, bird-like dromaeosaur).