A large, herbivorous, mainly bipedal dinosaur of the middle to late Cretaceous period, with jaws flattened like the bill of a duck.Also called duck-billed dinosaur
Family Hadrosauridae, infraorder Ornithopoda, order Ornithischia‘There is a parallel here with the hadrosaur and ceratopsian dinosaurs of the Late Cretaceous.’
- ‘The ornithopods included the hadrosaurs or duck-billed dinosaurs, in which the front of the mouth was enlarged to form a broad flat beak and a variety of bony crests were developed on top of the head.’
- ‘The Ornithopoda included the hadrosaurs, the iguanodontids, the heterodontosaurs, the hypsilophodontids, and various other dinosaurs.’
- ‘Samples were taken from hadrosaurs, dinosaurs with exclusively terrestrial life habitats, so that all animals lived in contact with fresh waters.’
- ‘These tooth marks suggest a diet of largely hadrosaurs and ceratopsians and typically occur more commonly on limb bones than on vertebrae.’
Late 19th century from modern Latin Hadrosaurus (genus name), from Greek hadros ‘thick, stout’ + sauros ‘lizard’.