Tyrannosaurus rex T-rex "Hank" large rib cast replica
This Tyrannosaurus rex humerus is cast from a newly discovered and undescribed specimen located in the upper Cretaceous rocks of northern Montanas Hell Creek Formation. This new Trex is dubbed Hank after the discoverer. There are only about 30 named specimens of Trex in the world and while their bones are indeed rare casts, of original bones of Trex made available to the public are even more rare.