Data from: Ecological adaptation and birdsong: how body and bill sizes affect passerine sound frequencies

Gonçalo C. Cardoso, Jakob Isager Friis, Joana Sabino, Pedro Santos & Torben Dabelsteen
The avian bill is finely adjusted to foraging ecology and, as part of the vocal tract, it may also affect sexual signals such as songs. Acoustic theory predicts that larger bills lower the resonant frequency of vocal tracts, allowing larger-billed species to emphasize lower sound frequencies. Theory also predicts that larger-billed species can change bill gape so as to sing over a wider frequency bandwidth. We tested these associations between bill size and sound frequencies...
This data repository is not currently reporting usage information. For information on how your repository can submit usage information, please see our documentation.