Mating assay (IMAGE) Max Planck Institute for Chemical Ecology Caption Mating arena for vinegar flies: For the study, Mohammed Khallaf recorded the mating behaviors of 99 different species of flies of the genus Drosophila. The species not only differed in terms of their chemical communication based on different sex pheromones. Rather, the behavior of individual species can also differ astonishingly from that of closely related species. Credit Anna Schroll Usage Restrictions None License Licensed 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.