Bottlenose Dolphin Family (IMAGE) University of Plymouth Caption Mother and calf bottlenose dolphins - often mothers and calves use signature whistles to stay in contact Credit Simon Elwen, Namibian Dolphin Project 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.