Duck-billed Dinosaurs’ Jaws Unique

Edmontosaurus skull, Oxford University Museum of Natural History. Photo credit:  Ballista

Edmontosaurus skull, Oxford University Museum of Natural History. Photo credit: Ballista

A recent study published in the Proceedings of the National Academy of Sciences found the duck-billed dinosaur Edmontosaurus had a unique jaw.  By studying the scratches found on the hadrosaur’s teeth, researchers found that its jaw movement included sideways and front to back motions in addition to traditional up and down jaw movement.  This made the chewing motion of the Edmontosaurus completely unique.  The study also suggests that the wear pattern on the teeth was similar to that found in the grazing animals of today.  While grasses were not common to this time period, the researcher suggest that hadrosaurs grazed on low-lying vegetation like horsetails.  For more information on this study, see MSNBC’s Cosmic Log.

This photo licensed under the  GNU Free Documentation License, Version 1.2 or later.

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