Following up on Vincent Janik and Stephanie King's recent PNAS article 'Bottlenose dolphins can use learned vocal labels to address each other' The Smithsonian.com reports on the study with accompanying media samples in 'Surprising Science':
"The new work provides further evidence that these whistles are used to distinguish one dolphin from another, and that the dolphins identify themselves by the sound of their own chirp. In the study, the researchers found that when they recorded the signature whistles of wild bottlenoses and played them back to them, they responded by repeating the call. When the researchers played the chirps of other dolphins, the creatures stayed silent, or made unrelated, non-whistling noises."
see here for further details
contact: Prof Vincent Janik