Songbirds use pulse tone register in two voices to generate low-frequency sound.

@article{Jensen2007SongbirdsUP,
  title={Songbirds use pulse tone register in two voices to generate low-frequency sound.},
  author={Kenneth Kragh Jensen and Brenton G Cooper and Ole Naesbye Larsen and Franz Goller},
  journal={Proceedings. Biological sciences},
  year={2007},
  volume={274 1626},
  pages={
          2703-10
        }
}
The principal physical mechanism of sound generation is similar in songbirds and humans, despite large differences in their vocal organs. Whereas vocal fold dynamics in the human larynx are well characterized, the vibratory behaviour of the sound-generating labia in the songbird vocal organ, the syrinx, is unknown. We present the first high-speed video records of the intact syrinx during induced phonation. The syrinx of anaesthetized crows shows a vibration pattern of the labia similar to that… CONTINUE READING

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