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Iguanodon

This spike-thumbed beast was one of the first dinosaurs to be named. As Dr. Egerton explains, scientists’ understanding of Iguanadon has gone throu...

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Hypacrosaurus

Dinosaurs A to Z Videos • 3m 14s

Hypacrosaurus—a duck-billed dinosaur like Edmontosaurus—has a hollow bony crest on its head. Why do you think they had these? Dr. Egerton shares some paleontologists’ theories about these adult Hypacrosaurus crests.

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    Iguanodon

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    This spike-thumbed beast was one of the first dinosaurs to be named. As Dr. Egerton explains, scientists’ understanding of Iguanadon has gone through some significant changes since its discovery in the 19th century.

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    Dr. Egerton introduces us to Kentrosaurus, a herbivorous dinosaur with large plates along their back and spikes at the end of their tails. Why do you think they had all of these plates and spikes?

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