Guppies (1 of 2) (IMAGE) University of Exeter Caption Guppies are known to develop long and stable social relationships. Credit University of Exeter Usage Restrictions This image may only be used in reports of this research paper. 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.