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Iguanodons got their name because they have teeth similar to an iguana—but this dinosaur wouldn't fit in any classroom terrarium. This plant-eating dinosaur could weigh several tons and grow to be over 30 feet long. Readers will find out why scientists think this animal switched between walking on four feet to two feet and what its thumb spike was used for. Sidebars provide extra excellent tidbits, and full-color illustrations help readers visualize the information in the text.