Lanzhousaurus is a genus of dinosaur from the Early Cretaceous Period. It was discovered in the Gansu region of China in 2005. The type species, L. magnidens, was described based on partial skeletal remains.

Lanzhousaurus had very huge teeth, and perhaps the largest of any herbivorous animal ever found. This indicates that it was an iguanodont dinosaur. The jawbone, which was over 40 inches long, suggests that this specimen was a very large animal.

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