Dr. Steven Ramm, Bielefeld University (IMAGE) Bielefeld University Caption Dr. Steven Ramm from Bielefeld University has compiled a special issue on sperm competition. Credit Photo: Bielefeld University Usage Restrictions The image may only be used with appropriate caption or 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.