<i>Leptopilina boulardi</i> (IMAGE) Max Planck Institute for Chemical Ecology Caption A parasitic wasp (Leptopilina boulardi) lays its eggs into larvae of the vinegar fly Drosophila melanogaster. In nature, many Drosophila larvae are killed this way. However, both larvae and adult flies are able to sense and actively avoid the wasps' odor. Credit Markus Knaden / Max Planck Institute for Chemical Ecology 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.