Troodon

Troodon is a genus troodont from North America during the late-cretaceous-period, around seventy-one-million-years ago.

Facts
Unlike the dromaeosaurs, Troodon and its kin are omnivorous, willing to eat both plants and meat. Another difference is that the sickle-claws were not as large or recurved as in dromaeosaurs.

In the film
A pack of Troodon appear attacking the Maiasaura nests, eating and stepping on several eggs, including Mother's except for Light and Heart's eggs.

Trivia

 * In real life, Egg Mountain, where the film takes place, has yielded Troodon eggs (initially mistaken for the ornithopod Orodromeus, which doesn't appear).