Cosmetic Coloration in Birds: Occurrence, Function, and Evolution

@article{Delhey2007CosmeticCI,
  title={Cosmetic Coloration in Birds: Occurrence, Function, and Evolution},
  author={Kaspar Delhey and Anne Peters and Bart Kempenaers},
  journal={The American Naturalist},
  year={2007},
  volume={169},
  pages={S145 - S158}
}
Colorful plumages are conspicuous social signals in birds, and the expression of these colors often reflects the quality of their bearers. Since mature feathers are dead structures, plumage color is often considered a static signal that does not change after molt. Feathers, however, can and do deteriorate between molts, and birds need to invest heavily in plumage maintenance. Here we argue that this need for preserving plumage condition and hence signaling content might have given rise to a… 
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