Three-Spined Stickleback (image) University of Bonn Share Print E-Mail Caption Three-spined stickleback (Gasterosteus aculeatus). Credit © Foto: Simon Vitt Usage Restrictions This photo may be used with the press 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.