Maiasaura is an extinct genus of hadrosaurid dinosaur that lived in what is now North America during the Late Cretaceous Period, about 76.5–75.5 million years ago. It
From Wikipedia
Maiasaura is a large herbivorous saurolophine hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana and the Canadian province of Alberta, in the Upper Cretaceous, from 86.3 to 70.6 million years ago.