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Hadrosaurs, the "duckbilled dinosaurs", were common in the Upper Cretaceous of Europe, Asia, and North America. They were members of the Ornithopoda, and close relatives and possibly descendants of the earlier iguanodontid dinosaurs. The morphology of the two subfamilies, Lambeosaurinae and Hadrosaurinae, is discussed, including the purpose of the crest on the head of the former. Two other fossils are also described, Edmontosaurus and a baby Maiasaura.
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Subject: Biology Resource Type: Scientific Resources:Overview/Reference Work Grade Level: College Upper (15-16), Informal, College Lower (13-14), High School (9-12) Focus on the Cretaceous: Paleontology Topics: Biosphere, Time/Earth History