Ankylosaurus had a beak and small teeth, which it used to browse the large quantities of plants necessary to sustain a three- to four-ton body. Ankylosaurus magniventris was the biggest and ...

Ornithischians were one of the two major groups of dinosaurs and included such familiar species as the armor-plated Stegosaurus and Ankylosaurus ... and jaws and teeth designed to chew plants ...