A Butterfly Sex Role Reversal (IMAGE) Yale University Caption When temperatures are cooler, female Bicyclus anynana actively court males, which take on the same role when temperatures are warmer. Credit William H. Piel and Antonia Monteiro/Courtesy of Yale University Usage Restrictions for use by all, with proper credit 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.