It weighed about as much as a German shepherd dog. Without doubt, its most bizarre features are its specialised teeth and jaws. The first tooth of the lower jaw is oriented almost horizontally, projecting forward instead of upward. Prof Sampson said: "We weren't even sure it belonged to a dinosaur. It was only after we compared it with the lower jaws of other carnivorous dinosaurs that we became convinced as to the nature of the owner."