Hyenas (IMAGE) University of Nebraska-Lincoln Caption A study has revealed that long-distance hyena calls feature signatures unique to individuals — a form of caller ID distinct enough that hyenas can likely tell one from another. Credit Eli Strauss Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.