In the latest episode of a long-standing debate over the identity of a set of dinosaur fossils, a controversial new study has found that the dino bones belong not to a young Tyrannosaurus rex but to a separate species: Nanotyrannus lancensis.
In the decades since the first skull was discovered in Montana in 1942, paleontologists have gone back and forth on whether the skull and later fossil discoveries belong to a distinct species or to juvenile T. rexes.
