DISPLAY, TIMING AND FUNCTION OF WING MOVEMENTS ACCOMPANYING ANTIPHONAL DUETS OF CICHLADUSA GUTTATA by DIETMAR TODT and ANNE FIEBELKORN1) (Arbeitsgruppe Verhaltensbiologie, Institut f. Allgem. Zoologie, Freie Universität Berlin, Germany) (With 9 Figures) (Acc. 25-VII-1979) INTRODUCTION Many tropical bird species which develop and maintain stable pair bonds perform antiphonal duets. Generally, the sexes are monomorphic in these species. However, male and female can be distinguished by their duet con- tributions. When duetting antiphonally the birds perform specific sound patterns each precisely coordinated to the other's. In many cases the vocal duet contributions are accompanied by characteristic movements of body, tail and wings. There are plenty of publications dealing with structure and functions of acoustic duet signals (reviews: THORPE, 1972 ; v. HELVERSEN, 1979). On the other hand, there is a need for investigations concerning the non-acoustic display. We have studied this display, its timing, its coordination, and its functions in 2 African thrush species: Heuglins Robin Chat (Cossypha heuglini) and the Spotted Morning Warbler ( Cichladusa guttata). Both prefer open habitats including dense vegetation. However, they occur allop.atrically (MACKWORTH-PREAD & GRANT, 1955). Whereas the vocal behaviour of Cossypha heuglini has already been described (ToDT, 1971, 1975; TH,ORPE, 1972; FARKAS,
Behaviour – Brill
Published: Jan 1, 1980
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