oa Journal of East African Natural History - Observation on colonial breeding in the Black-headed Weaver and Vieillot's Black Weaver



The observations reported here were carried out near Kampala between 1962 and 1966. The species involved, the Black-headed Weaver Ploceus cucullatus bohndorffi (Reichenow) and Vieillot's Black Weaver Melanopteryx nigerrimus nigerrimus (Vieillot), are the commonest weaver birds in that area. General descriptionptions may be found in Jackson (1938), Bannerman (1949), Chapin (1954) and Mackworth-Praed & Grant (1955). One of the most striking features of their biology is the frequent occurrence of colonies of both species in the same site. Questions as to why this happens lead to a consideration of the advantages of colonial breeding, which are uncertain. At the same time, since these weavers appear to be closely similar in habits and ecology, problems of inter-specific competition are raised. The data descriptionbed throw some light on these problems.


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