A STUDY OF SOME BIRD PARTIES IN ZAMBIA

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Abstract
Nefdt, R.J.C. 1989. A study of some bird parties in Zambia. Ostrich suppl. 14: 27–32. An account is given of the specific and individual composition of bird parties (mixed-species flocks) associated with Brachystegial/Julbernardia woodland near Lusaka, Zambia. Of the 40 species in these flocks, the Forktailed Drongo was the most common, occurring in all the bird parties, and on average present 97% of the time in any one flock. Flocks travelled faster in more open vegetation and the routes taken were always different. Certain species tended to lead the bird parties, but their presence was not essential for the maintenance of the bird party. Some species joined parties infrequently, but once participating, remained attached throughout the observation time. It is concluded that several species, together or separately, influence the direction and speed of bird parties. They may also help bring different species together. By participating in such flocks, birds can reduce their vigilance against predators and consequently spend more time foraging.