Voice breaking in males results in sexual dimorphism of green woodhoopoe calls

@inproceedings{Radford2004VoiceBI,
  title={Voice breaking in males results in sexual dimorphism of green woodhoopoe calls},
  author={Andrew N Radford},
  year={2004}
}
Ontogenetic changes and sexual differences in the acoustic structure of green woodhoopoe (Phoeniculus purpureus) ‘kek’ calls were investigated in a wild population. At fledging, the calls of males and females were indistinguishable in terms of fundamental frequency, frequency modulation, peak frequency and call duration. After 3-5 months, however, the male voice ‘broke’ (i.e. underwent a significant decrease in fundamental frequency), while there was no change in female call structure… CONTINUE READING

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