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The feeding pattern of the fruit bat Rousettus aegyptiacus in captivity.

An electrical apparatus was designed to record continuously the feeding activity of either a colony of 30 fruit bats (Rousettus aegyptiacus) or single bats in captivity. The endogenous feeding activity rhythm was synchronized by change in the external light-dark cycle. During June to August (winter), the bats consumed an average of 96 g sliced banana, equal to 76 g wet weight/100 g body weight per 24 hours or 15 g dry weight/100 g body weight per 24 hours. The feeding period began shortly after sunset and continued for 10,6 h. Feeding consisted of 6-14 separate small meals. The mean or overall feeding rate was 9,1 g banana/h, and the feeding rate during the first 3 h, 13,1 g/h. The bat regulated its food intake by varying the rate of food consumption and not by changing the duration of the feeding period. It is suggested that clustering of the bats may influence the caloric intake by reducing the energetic cost of thermoregulation.