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Saurolophus (pronounced sawr-OHL-oh-fuss or SAWR-oh-LOHF-us) was a duck-billed dinosaur (a hadrosaur) from the late Cretaceous period, about 72 to 68 million years ago. Saurolophus means "Crested Lizard."

Anatomy: Saurolophus had a 5 inch (13 cm) long bony spike extending up from its forehead. Saurolophus was about 30-40 feet (9-12 m) long, had a toothless beak whose top bill curled slightly upwards, had cheek teeth, and could walk on two or four legs. The rear legs were much larger than the front legs.

Diet: Saurolophus was an herbivore, a plant-eater. It had hundreds of closely-packed cheek teeth that ground up its food.

Fossils: Fossils of this duck-billed dinosaur have been found in Alberta, Canada, and Mongolia. Saurolophus was named by paleontologist Barnum Brown in 1912. The type species is S. osborni.

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