<i>Manduca sexta</i> Ovipositing (IMAGE) Max Planck Institute for Chemical Ecology Caption Female tobacco hawkmoths prefers to lay their eggs on the underside of their host plants, such as wild tobacco <i>Nicotiana attenuata</i>. However, if a tobacco hornworm is already feeding on a plant, the moth recognizes certain odor cues in the frass of the larva. A receptor protein that is involved in the detection of these compounds in the feces of caterpillars ensures that the female insects avoid attacked plants and look instead for another, better oviposition site. Credit Danny Kessler, 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.