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Hadrosaurs are the largest Ornithiscian herbivores of the late Cretaceous. They were flat-headed and evolved from intermediate Iguanodon-Hadrosaur forms like Telmatosaurus, Equijubus, Gilmoreosaurus, and Protohadros. Some had large, hollow crests for noise making, like the Lambeosaurines, and some had small, hard crests, like the Hadrosaurines.

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