Dolphin Signatures (video) National Institute for Mathematical and Biological Synthesis (NIMBioS) Share Print E-Mail Loading video... Caption Click to hear the sound frequencies of four signature whistles from four different dolphins. The spectrograph visually displays the differences in the frequencies, but in a new study, scientists have developed a more efficient method for analyzing the unique "tune" of a dolphin's signature whistle. Credit Arik Kershenbaum/NIMBioS Usage Restrictions Please attribute. Share Print E-Mail 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.