When Lambeosaurus Lived: Lambeosaurus lived during the Cretaceous period, about 83 to 65 million years ago; a huge mass extinction killed the dinosaurs 65 million years ago.

Anatomy: Lambeosaurus was a crested, duck-billed dinosaur. Its forward-leaning, hollow, bony crest was as big or bigger than the rest of its skull and may have been used to produce sounds, enhance its sense of smell, and/or used in courtship displays. Lambeosaurus' nostrils went up through the crest. Its snout was narrow and ended in a beak that was wide and blunt. Males may have had larger crests than females. Lambeosaurus had pebbly-textured skin and webbed fingers. Its sight and hearing were keen, but it had no natural defenses. Lambeosaurus grew to be about 30-50 feet long (9-15 m), weighing 5.6 tons. It is the largest-known duck-bill dinosaur.

Diet: Lambeosaurus was an herbivore (a plant-eater), eating pine needles, the leaves of flowering trees, and twigs.

Name: Lambeosaurus means "Lambe's lizard." Lambeosaurus was named by Dr. William A. Parks in 1923 to honor Lawrence Lambe, an early Canadian fossil hunter.

Fossils: Many Lambeosaurus fossils have been found in North America, including Montana (USA), Baja California (Mexico), and Alberta (Canada). It was the first duck-billed dinosaur found in North America. Fossilized skin and hand-prints have been found.