Bald dino casts doubt on feather theory

@article{Sanderson2007BaldDC,
  title={Bald dino casts doubt on feather theory},
  author={Katharine Sanderson},
  journal={Nature},
  year={2007}
}
Fossil calls into question the purpose of the first feathers. 

References

A new Chinese specimen indicates that ‘protofeathers’ in the Early Cretaceous theropod dinosaur Sinosauropteryx are degraded collagen fibres
TLDR
A new specimen of Sinosauropteryx is reported which shows that the integumental structures proposed as protofeathers are the remains of structural fibres that provide toughness.