Maiasaura

Maiasaura is a hadrosaur from North America during the late-cretaceous period, around seventy-six-million-years ago.

Facts
Maiasaura got its name due to being discovered with eggs. They had a small, spiky crest in front of the eyes. This crest may have been used in headbutting contests between males during the breeding season.

In the film
Light, his mother and siblings and several unnamed Maiasaura appear, being the first animals to do so.