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Kleptoparasitic behaviour in the stream-living semiaquatic bug Velia caprai (Tam.) was studied in laboratory experiments. Prey weighing < 7.9 mg were successfully defended against competitors. A positive correlation was found between prey weight (> 7.9 mg) and the number of V. caprai feeding simultaneously on it. Large prey animals always attracted several individuals. When five equally hungry individuals were allowed to attack a large prey I found significant negative regressions between attack order and weight increase and attack order and time spent feeding. Ingestion rate showed a significant positive regression with attack order. The second attacker tended to increase in weight as much as the first but tended to have a higher ingestion rate. When individuals of three different hunger levels were allowed to attack a large (> 7.9 mg) prey, the most hungry ones attacked first.
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