Hippos respond to recorded calls (VIDEO) Cell Press This video is under embargo. Please login to access this video. Caption A group of hippos responds vocally to the recorded calls of other hippos. Credit Nicolas Mathevon Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.