Portraits of Nine Paper Wasps (IMAGE) University of Michigan Caption This is a portrait of nine Polistes dominulus paper wasps, illustrating the variation in facial patterns that functions as a signal of fighting ability Credit Elizabeth Tibbetts 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.