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Hadrosaurs “duckbills” were one of the most successful and interesting dinosaurs in the Cretaceous. Edmontosaurus was a large hadrosaur, comparable to Triceratops in its abundance. They could grow to the size of T. rex and could’ve lived in large herds hundreds strong, as indicated by massive bone beds. They were absolute eating machines with highly sophisticated teeth rivaling the tissue complexity of mammals, and mobile skulls allowing for a range of chewing motions. Some of the most common dinosaur fossils in the HCF are their teeth; they possessed hundreds of teeth in their mouths at a time, constantly grinding them down root and all. Identification: Their teeth are generally lanceolate or diamond-like in shape, with a central apicobasal ridge. They are usually very symmetric about the long axis of the tooth. There is no cingulum and they have smoother enamel than ceratopsids. References: Gregory M. Erickson et al., Complex Dental Structure and Wear Biomechanics in Hadrosaurid Dinosaurs. Science 338, 98-101 (2012). DOI:10.1126/science.1224495 Mallon JC, Anderson JS (2014) The Functional and Palaeoecological Implications of Tooth Morphology and Wear for the Megaherbivorous Dinosaurs from the Dinosaur Park Formation (Upper Campanian) of Alberta, Canada. PLoS ONE 9(6): e98605. doi:10.1371/journal.pone.0098605 LeBlanc, A.R.H., Reisz, R.R., Evans, D.C. et al. Ontogeny reveals function and evolution of the hadrosaurid dinosaur dental battery. BMC Evol Biol 16, 152 (2016). https://doi.org/10.1186/s12862-016-0721-1

Phalange III-1 of the left foot of a hadrosaur, likely Edmontosaurus. Has some dorsoventral crushing and repair.