Female Mocker (Left) And Monarch Model (IMAGE) University of Exeter Caption Scientists have discovered the genetic switch that allows female swallowtails to look like different Monarch butterflies and thus avoid being eaten. Credit Richard ffrench-Constant Usage Restrictions credit Richard ffrench-Constant 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.