English: Lanzhousaurus is a genus of ornithopod dinosaur that lived in what is now China during the Early Cretaceous. It has been estimated to be about 10 m in length and 6 t in weight. The teeth that have been preserved in the meter-long lower jaw of Lanzhousaurus have been described as “astonishingly huge",‭ ‬and at 14 centimeters in length each, are among the largest of any herbivorous creature ever. The teeth indicate it was a styracosternan iguanodont, and the tooth enamel of this dinosaur grew very rapidly.