Oryctodromeus cubicularis

This ornithopod was widely publicized recently because it was found in a sandstone filled burrow. A BURROW. Which is important because it allows us to peek into dinosaur's personal lives and confirm that dinosaurs were more behaviorally complex than most people believe. Osteologically-wise, it also lacked ossified tendons on the tail, which is a feature most ornithopods have (keeps them rigid), this allowing it more flexibility in the legs, which makes it easy for burrowing.

So, yeah. I'm not too popular with ornithopods (not many are), but this is a group that needs to be better documented artistically.