Reproductive success as a function of trill quality.

<p>A: Vocal deviation, B: Trill consistency. Trill measures are the least squares means for each male for each year, correcting for trill type, pitch, trill duration, and time in song. Least squares means for trill consistency were back-transformed for visualization. Neither trill measure was significantly correlated with reproductive success in statistical models including all trills measured for each male. For vocal deviation, lower scores correspond to more challenging songs; for trill consistency, higher scores are more challenging songs.