Song characteristics are age dependent in the willow warbler, Phylloscopus trochilus

@article{Gil2001SongCA,
  title={Song characteristics are age dependent in the willow warbler, Phylloscopus trochilus},
  author={D. Gil and J. Cobb and P. Slater},
  journal={Animal Behaviour},
  year={2001},
  volume={62},
  pages={689-694}
}
Theory predicts that sexually selected characters should be condition dependent if they are to be used as honest signals of male quality. One consequence of this dependence is that young and older males will differ in the expression of these characters. Many bird song characteristics, such as repertoire size or song length, are considered to have evolved through sexual selection. Consistent with this, several studies have shown that repertoire size increases with age. However, many of these… Expand
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