Troodon
Troodon nests full of eggs have been found in Montana. When scientists CAT-scanned them, they found baby Troodon skeleton embryos inside of them. They found skeletons of a small plant-eating dinosaur named Orodromeus with the eggs, as well as a skeleton of an adult Troodon. At first, it was believed that the eggs had belonged to the Orodromeus, and that the Troodon was there intending to rob the nest.