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Description
Size comparison of large animals that lived in North America between 85 million years ago and 65 million years ago.
Upper row: Leptoceratops gracilis (small, primitive ceratopsian), Pachycephalosaurus wyomingensis (large, herbivourous dinosaur with thick bone dome atop it's skull), Didelphodon vorax (badger-sized carnivorous marsupial), Albertosaurus sarcophagus (large tyrannosaurid), Struthiomimus altus (omnivorous, ostrich-like theropod), Deinosuchus rugosus (giant alligator) and Ankylosaurus magniventris (huge armored dinosaur with bone club on a tip of it's tail).
Middle row: Triceratops horridus (huge, three-horned ceratopsian), Chirostenotes pergracilis (feathered oviraptorosaur with large head crest), Einiosaurus procurvicornis (large ceratopsian with forward-curving horn), Stegoceras validum (small thick-headed dinosaur), Styracosaurus albertensis (ceratopisan with long horns on it's neck frill) and Nyctosaurus gracilis (small toothless pterosaur with enermous head crest).
Lower row: Thescelosaurus neglectus (armored ornithopod), Tyrannosaurus rex (giant theropod, apex predator of Late Cretaceous North America), Troodon formosus (nocturnal, highly-intelligent theropod) Edmontonia longiceps (large nodosaur with massive shoulder spikes) and Parasaurolophus walkeri (hadrosaur with long head crest)

Description
Size comparison of large animals that lived in North America between 85 million years ago and 65 million years ago.
Upper row: Leptoceratops gracilis (small, primitive ceratopsian), Pachycephalosaurus wyomingensis (large, herbivourous dinosaur with thick bone dome atop it's skull), Didelphodon vorax (badger-sized carnivorous marsupial), Albertosaurus sarcophagus (large tyrannosaurid), Struthiomimus altus (omnivorous, ostrich-like theropod), Deinosuchus rugosus (giant alligator) and Ankylosaurus magniventris (huge armored dinosaur with bone club on a tip of it's tail).
Middle row: Triceratops horridus (huge, three-horned ceratopsian), Chirostenotes pergracilis (feathered oviraptorosaur with large head crest), Einiosaurus procurvicornis (large ceratopsian with forward-curving horn), Stegoceras validum (small thick-headed dinosaur), Styracosaurus albertensis (ceratopisan with long horns on it's neck frill) and Nyctosaurus gracilis (small toothless pterosaur with enermous head crest).
Lower row: Thescelosaurus neglectus (armored ornithopod), Tyrannosaurus rex (giant theropod, apex predator of Late Cretaceous North America), Troodon formosus (nocturnal, highly-intelligent theropod) Edmontonia longiceps (large nodosaur with massive shoulder spikes) and Parasaurolophus walkeri (hadrosaur with long head crest)