Abstract
Previous ethological studies of the budgerigar (Melopsittacus undulatus) have provided a functional description of the vocal repertoire [B. F. Brockway, Anim. Behav. 23, 294–324 (1964)]. The present study describes the acoustic structure of each of these complex vocalizations with an emphasis on the contact call. Acoustic features of each vocalization were measured from standard sonograms. Most of the vocalizations of the budgerigar are short, discrete calls varying in duration between 20 and 200 ms. A long, rambling courtship vocalization is also described which varies in duration from 10 s to 1 min. This vocalization is composed of many different elements and is performed primarily by males. This courtship vocalization may be functionally similar to the song of oscine song birds. The acoustic properties of these vocalizations are discussed in relation to the hearing capabilities of the budgerigar. [Work supported by NICHHD and NINCDS.]
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