All dinosaurs descended from reptiles called Archosaurs. From there, dinosaurs branched out into two major groups, Saurischia and Ornithischia, based on the shape and orientation of their pelvis. In Ornithischian dinosaurs, such as Stegosaurus and Hadrosaurs, the pubis bone faces backward and down.
Across both groups, dinosaurs varied greatly in size. Some were small, like Compsognathus, which was barely larger than a chicken. Others were gigantic, like Dreadnoughtus, which was 85 feet long and weighed 65 tons -- making it the largest land animal to have ever lived. Dinosaur diets varied, as well. Herbivores, like Hadrosaurs, evolved to have specialized teeth for grinding tough plant material.
Some predators, like the raptor Deinonychus, even hunted in packs. Social behaviors were also found in other dinosaurs. The Scientific American Book of Dinosaurs. Martin's Press. UC Berkeley. Retrieved 21 January Journal of Systematic Palaeontology. Holland and the Sprawling Sauropods".
How palaeontology got cool: Inside the revolution in dinosaur science
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In Currie, Philip J. The Encyclopedia of Dinosaurs. San Diego: Academic Press. Implacable November weather. As much mud in the streets, as if the waters had but newly retired from the face of the earth, and it would not be wonderful to meet a Megalosaurus, forty feet long or so, waddling like an elephantine lizard up Holborne Hill.
Bleak House. Farlow, James O. This audio file was created from a revision of the article " Dinosaur " dated , and does not reflect subsequent edits to the article. Audio help. More spoken articles. Avemetatarsalians Dinosauromorpha and relatives. Dongusuchus Spondylosoma Teleocrater Yarasuchus.
Austriadactylus Preondactylus. Caviramus Raeticodactylus. Arcticodactylus Austriadraco. Carniadactylus Eudimorphodon. Caelestiventus Dimorphodon. Bergamodactylus Campylognathoides. Klobiodon Parapsicephalus. Fenghuangopterus Jianchangnathus Jianchangopterus Scaphognathus. Allkaruen Sordes Monofenestrata see Monofenestrata. Dromomeron Ixalerpeton Lagerpeton. Lagosuchus Marasuchus Teyuwasu? Nyasasaurus Saltopus. Pseudolagosuchus Sacisaurus Silesaurus Soumyasaurus Technosaurus?
Caseosaurus Chindesaurus Herrerasaurus Sanjuansaurus Staurikosaurus. Buriolestes Eoraptor? Guaibasaurus Panphagia. Chromogisaurus Pampadromaeus? Jaklapallisaurus Macrocollum Unaysaurus. Euskelosaurus Plateosauravus Plateosaurus Ruehleia? Xixiposaurus Yimenosaurus. Gryponyx Gyposaurus. Eucnemesaurus Riojasaurus.
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