Dolphin 2 (IMAGE) Stellenbosch University Caption Mother and calf bottlenose dolphins off the coast of Walvis Bay in Namibia. Often mothers and calves use signature whistles to stay in contact. Credit Dr Simon Elwin 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.