Raven (IMAGE) University of Vienna Caption Cognitive biologists now revealed that ravens use a "divide and rule" strategy in dealing with the bonds of conspecifics. Credit Copyright: Jorg Massen 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.