 There is now no doubt that many theropod dinosaur species had feathers, including "Shuvuuia", "Sinosauropteryx" and "Dilong" (an early tyrannosaur).These have been interpreted as insulation and therefore evidence of warm-bloodedness.But direct, unambiguous impressions of feathers have only been found in coelurosaurs (which include the birds and tyrannosaurs, among others), so at present feathers give us no information about the metabolisms of the other major dinosaur groups, e.g.