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Iguanodon (ig-WHA-noh-don) means "iguana tooth" because its teeth were similar to those of an iguana lizard, except much bigger. It could stand on its hind legs or walk on all-fours. The three toes on each hind foot ended in hoof-like claws, and each five-fingered front foot had a spiked thumb for self defense. Iguanodon bit off vegetation with its horn-covered beak and roamed the land in herds.

Length: 30 feet
Weight: 4.5 tons
Time: 119 - 105 million years ago
Where Found: Central Texas, South Dakota, England, western Europe

Think About It: How do scientists determine that some dinosaurs traveled in herds? What evidence could they use?