There is no question that M. gui had true pennaceous feathers essentially identical to those of modern birds. These feathers are not to be confused with the so-called “protofeathers” reported on early Cretaceous theropods of China such as Sinosauropteryx or the herring bone patterns found in the skin of other theropod dinosaurs such as Sinornithosaurus. These structures bear no real resemblance to feathers and may be better interpreted as interwoven collagen fibers in the dermis of these animals