The first known fossilized skin impressions for Tyrannosaurus rex suggest that this gigantic carnivore, unlike many other dinosaurs, had little to no feathers. The fossils, reported in the journal Biology Letters, show that T. rex was instead covered with a tough and scaly hide. Fossilized skin impressions for other tyrannosaurs — including Albertosaurus, Gorgosaurus, and Daspletosaurus — reveal that all such dinosaurs lacked feathers, too.