Song correlates with social context, testosterone and body condition in male barn swallows

@article{Galeotti1997SongCW,
  title={Song correlates with social context, testosterone and body condition in male barn swallows},
  author={Paolo Galeotti and Nicola Saino and Roberto Sacchi and A. P. M{\O}ller},
  journal={Animal Behaviour},
  year={1997},
  volume={53},
  pages={687-700}
}
Bird song, like many other male secondary sexual characters, may have evolved as intra- or inter-sexual signals of male phenotypic quality. The hypotheses that song rate and song features reflect androgen levels and body condition, qualities useful in male-male competition, and that they are also influenced by social context, was tested for the first time in the present correlational study. The relationships between song rate and 14 variables describing song structure, respectively, and… 
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