Paleobiology
As hadrosaurids, individuals of Edmontosaurus annectens would have been large herbivores, eating plants with a sophisticated skull that permitted a grinding motion analogous to chewing. Their teeth were continually replaced and packed into dental batteries that contained hundreds of teeth, only a relative handful of which were in use at any time. Plant material would have been cropped by the broad beak, and held in the jaws by a cheek-like structure. Feeding would have been from the ground up to around 4 meters (13 ft) above. Like other hadrosaurs, they could have moved both bipedally and quadrupedally.
The extensive depressions surrounding its nasal openings may hosted nasal diverticula. These postulated diverticula would have taken the form of inflatable soft-tissue sacs. Such sacs could be used for both visual and auditory signals.
Read more about this topic: Edmontosaurus Annectens