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Unformatted text preview: (although ducks lack teeth). There were two subgroups of hadrosaurs. The crested lambeosaurs, and the noncrested hadrosaurines. The latter group is exemplified by Maiasaura and Edmontosaurus . The lambeosaurs are exemplified by Parasaurolophus . Maiasaura , the "good mother lizard" has been extensively studied for its nesting and parental care. Another major group of Cretaceous ornithischians was the ankylosaurs, the armored, quadrupedal herbivores. Unlike the Jurassic stegosaurids, the armor covering on the back was more robust, as were the spikes behind the shoulders. In some ankylosaurs the tail terminated in a bony knob that might have been used to sweep the legs of predators, possibly even breaking bones....
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- Fall '10