Sexual Size Dimorphism (IMAGE) University of Arizona Caption Sexual size dimorphism: Female hawk moths (left) are larger than their male counterparts. Credit R. Craig Stillwell Usage Restrictions Image may be used only in reference to the posted news release. 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.