Sexual differences in vocalisations and playback-response behaviour of the Vanuatu petrel (Pterodroma occulta)
|Title||Sexual differences in vocalisations and playback-response behaviour of the Vanuatu petrel (Pterodroma occulta)|
|Publication Type||Journal Article|
|Year of Publication||2012|
|Type of Article||Article|
|Keywords||Pterodroma occulta, Vanuatu petrel, vocalisations|
Sexual differences in vocalisations of the Vanuatu petrel (Pterodroma occulta) are described. Qualitative differences in burrow calls could be used to sex adults with 63-100% accuracy in listening experiments. Males sounded “clear” and females sounded “hoarse”. Higher accuracy is possible with the aid of spectrograms. Playback experiments demonstrated a male-bias in responses of incubating Vanuatu petrels to “war-whooping” and flight calls. Acoustic methods have practical and ethical advantages over handling breeding petrels and further studies of the vocal behaviour of gadfly-petrels are encouraged.