 With Benjamin Waterhouse Hawkins, Owen had nearly two dozen lifesize sculptures of various prehistoric animals built out of concrete sculpted over a steel and brick framework; two "Mantellodon", one standing and one resting on its belly, were included.Before the sculpture of the standing "Mantellodon" was completed, a banquet for twenty was held inside it.The discovery of much better specimens of "Iguanodon bernissartensis" in later years revealed that the horn was actually a modified thumb.