Paleontologists have examined an exceptionally well-preserved, near somatically mature tyrannosaur skeleton from the Hell Creek Formation of Montana. Their results show that the specimen shares features with the holotype specimen of Nanotyrannus, and demonstrate that this lineage is distinguishable from Tyrannosaurus. A pack of Nanotyrannus brazenly attacks a juvenile Tyrannosaurus rex. Image credit: Anthony Hutchings. “This fossil flips decades...
