Sexual Size Dimorphism (image) University of Arizona Share Print E-Mail 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. Share Print E-Mail 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.