Dance flies mating (IMAGE) University of Gothenburg Caption The female receives a dead insect as a gift from the male during mating. The gift provides the female with the necessary protein to produce eggs. If the male arrives empty-handed, he is rejected. Credit Tom Houslay Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.