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any one of a large group of bipedal Upper Cretaceous dinosaurs of the genus Anatosaurus, Maiasaura, Edmontosaurus, and related genera: partly aquatic, with a duck-billed skull and webbed feet 鸭嘴龙 (Also called duck-billed dinosaur)
Much to their surprise, they found that onlyonegroup suffered from cancer-the hadrosaurs, or "duck-billed" dinosaurs. 29benigntumors were found in the tail bones of 97 animals.
About 70 million years ago, during the Cretaceous period, Lenny and a bunch of friends snuck out of the house to go tip over some Hadrosaurs that were grazing in a field in modern-day Mongolia.