Call types of the Common Swift   Apus apus: aduIt call given at the nest

BRETAGNOLLE V.

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Abstract:

Vocalizations of the Common Swifts were studi ed during two consecutive springs in southern France. I found that three cali types were given by the adults at the nest, and these are described quantitatively. Significant differences in the acoustic parameters of the calls are highlighted, as well as. a probable sexual dimorphism. This, together with the precise signification of the different cali types, rernam however to be critically assessed by playback experiments.