Oviraptor philoceratops
"ceratopsian-loving egg raider"

When first discovered in the 1920s, Oviraptor was laying on top of a fossilized nest in the Gobi Desert of Mongolia. It was thought at the time that the nest belonged to Protoceratops, and that Oviraptor was feeding on the eggs of the small ceratopsian (hence the name). It wasn't until 70 years later, in the early 1990s, that further expeditions revealed the same type of nests contained oviraptorid embryos, and that the dinosaurs were protecting their own eggs, not stealing those of other dinosaurs. In fact, other dinosaurs may have taken advantage of this protective nature. Along with the baby oviraptorids, in one nest, the fossilized skull of an infant dromaeosaur (similar to Velociraptor) was found, eggshell bits still stuck to it. It's possible that some dromaeosaurs may have been nest parasites, laying eggs in the nests of other species. In modern birds the alien hatchling may even push it's "siblings" out of the nest, further ensuring its own survival.

This drawing is based on the type specimen of Oviraptor philoceratops. After the genus was split off into Citipati, this is the only recognized specimen of O.philoceratops - the classic, tall-crested Oviraptor is now thought to be a species of Citipati, as are most of the nesting specimens.