Edmontosaurs

The Edmontosaurs was a large Hadrosaur (Duck-biled) Dinosaur that lived in the Late Cretaceous Period, 75-65 million years ago in wooded areas, valleys, hillsides, of North America.

The Edmontosaurs, one of the largest of the Hadrosaur had the typical flatted, toothless, duck-beak-like front to its mouth, with batteries of hundreds of huge cheek teeth behind for grinding its tough plant food.
Fossil of many individuals of this dinosaur have been found together, and remains come from widely spaced locations in North America, from Colorado to as far north Alaska, leading to suggestions that it migrated in huge herds.