The study on the biology and ecology of the ''warbler Acrocephalus: Acrocephalidae, Passeriformes was conducted from March to September 2010 in the Basin of Bukavu on Lake Kivu. 33 specimens of birds were caught with mist nets trapped in aquatic macrophytes. The observations with the naked eye and using a pair of binoculars have identified the reproductive behavior of the studied species. Stomach contents were analyzed to highlight the eating habits of the species. It was established that the species of the genus studied have a mainly insectivorous diet. They can complete their prey secondarily by Gamelidae crustaceans, mollusc, gastropods and insect eggs. The reproductive period extends from March to July with a peak in June. The nests are shaped like a hanging basket on aquatic macrophytes. The number of eggs is usually two in each nest. The morphometric data revealed that sexual dimorphism is not pronounced in these species.
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