Edmontosaurus
As a hadrosaurid, Edmontosaurus was a large terrestrial herbivore. Its 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.  It used its broad beak to cut loose food, perhaps by cropping, or by closing the jaws in a clamshell-like manner over twigs and branches and then stripping off the more nutritious leaves and shoots. Edmontosaurus and most other ornithischians probably had cheek-like structures, muscular or non-muscular. The function of the cheeks was to keep food in the mouth.  The animal's feeding range would have been from ground level to about  above.