Duck-billed dinosaurs had lots of teeth
Duck-billed dinosaurs (hadrosaurs), who lived in the Cretaceous period between 90 million and 65 million years ago, sported this unique dental system, which had never been fully understood until it was examined at the microscopic level through recent research conducted by Aaron LeBlanc, a University of Toronto Mississauga PhD candidate; his supervisor, Professor Robert Reisz (University of Toronto Mississauga vice-dean, graduate), and colleagues at the Royal Ontario Museum and the Museum of the Rockies.