4. Gryposaurus monumentensis/ the Hooked Beak Lizard
(Pronunciation: GRIP-oh-SORE-us MAHN-you-men-TEN-siss) This was a big-boned and duck-billed dinosaur that could have eaten any vegetation it stumbled across. It had a massive skull that was able to pack over 300 teeth that it used for cutting up fibrous greens. In addition to the 300 teeth, it had hundreds of more teeth for a replacement that rested on its jawbone for use anytime they were required.
Photo credit: Jens Lallensack
It lived about 75 million years ago in the Late Cretaceous. This plant-eating dinosaur may have been about 30 feet long as a fully grown dinosaur and had a head that was 3-foot long, almost as big as T Rex.