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Hadrosaurids
Temporal range: Upper Cretaceous
86–66 mya
FMNH Parasaurolophus fossil.jpg
Mounted skeleton of Parasaurolophus cyrtocristatus, Field Museum of Natural History
Oxford Edmontosaurus.jpg
Mounted skeleton of Edmontosaurus annectens, Oxford University Museum of Natural History
Scientific classification e
Unrecognized taxon (fix):Hadrosaurid
Type species
Hadrosaurus foulkii
Leidy, 1858
Subgroups
Synonyms
  • Trachodontidae Lydekker, 1888
  • Saurolophidae Brown, 1914
  • Lambeosauridae Parks, 1923
  • Cheneosauridae Lull & Wright, 1942
  • Ornithotarsidae Cope, 1871
The hadrosaurs
Edmontosaurus skull, Oxford University Museum of Natural History

Hadrosaurs (meaning "bulky lizards") were the family of duck-billed herbivorous dinosaurs. They were the most common dinosaurs in the long Upper Cretaceous.

Hadrosaurs ranged in size from 10 to 65 ft (3 to 20 m) long. They had horny, toothless beaks and hundreds of cheek teeth in the sides of their jaws. The duck-billed dinosaurs had the most teeth; they had up to about 960 cheek teeth. Hadrosaurs lived during the later Cretaceous, and their fossils have been found in North America, Europe, and Asia.Riff the Hadrosaur on Barney and Friends

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