Tyrannosaurus
The Jane specimen has become part of an argument that scientists have.  The scientists disagree whether Nanotyrannus is really a separate genus of tyrannosaurids. Jane's skull is almost exactly the same as the skull of the original Nanotyrannus specimen, which means they are the same species.  The Burpee Museum held a conference in 2005.  Paleontologists came to the conference and talked about whether these "pygmy tyrants" were adults from a small tyrannosaurid species or young Tyrannosaurus rexes. A few scientists thought they were adult small tyrannosaurids, but most of them decided they were probably young T. rexes.