This early cousin of Tyrannosaurus rex lived about 130 million years ago and was covered in hairlike protofeathers, which are precursors to the feathers of modern birds. It is named after the mythical Chinese Emperor dragon, Dilong, and from the fact that it was "paradoxically" small and feathered. The feathers were probably used for warmth, and scientists suspect that juvenile T-rexes might also have had feathers, and that the feathers were shed as the animal matured.