Why have birds got multiple sexual ornaments?

@article{Mller2004WhyHB,
  title={Why have birds got multiple sexual ornaments?},
  author={Anders Pape M{\o}ller and Andrew Pomiankowski},
  journal={Behavioral Ecology and Sociobiology},
  year={2004},
  volume={32},
  pages={167-176}
}
SummaryMales of many animals have more than a single exaggerated secondary sexual character, but inter-specific variability in the number of ornaments has never been explained. We examine three hypotheses that may account for the presence of multiple ornaments. First, the multiple message hypothesis proposes that each display reflects a single property of the overall quality of an animal. This is likely to be the case for ornaments that respond to condition on different time scales. Second, the… 

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...

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