Abstract
Bioacoustic characteristics of the screaming calls of the pallid swift (Apus pallidus) emitted by the breedings pairs in antiphonal sequence were studied. The calls alternate with precise time intervals. In 441 of our records each individual maintains constant spectrographic characteristics, while in 562 a mate shifts its sound features on to the partner ones. It is suggested that the last part of the call maintains the highest personal features allowing vocal individual recognition, and that the calls have a territorial function against conspecific intrusion in the nest-holes of the breeding pair.
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