Dryosaurus was a medium-sized herbivorous biped, related to Leaellynasaura and Othnielia. Many well-preserved specimens are known and it was obviously a very successful dinosaur as remains have been found from the modern USA to Tanzania. It may even have been migratory. Dryosaurus used its horny beak to crop low-growing vegetation and its stiff tail acted as a counterbalance when running.
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