Flexible molars made chewing champions out of duck-billed dinosaurs

Tiny scratches in the fossilized teeth of Edmontosaurus suggest these large herbivores may have had an unusual way of chewing

4:28pm, June 30, 2009

Duck-billed dinosaurs may have been the sheep of their ecosystems, instead of the deer.

Patterns of tiny scratches in the fossilized teeth of Edmontosaurus, a type of hadrosaur, suggest the dinos had more complex jaw movements than previously thought, and may have eaten grass-like plants instead of trees, researchers report online June 29 in the Proceedings of the National Academy of Sciences.

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