Voice registers M012 killer whale (AUDIO) University of Southern Denmark Your browser does not support the audio element. Caption Caption: Calls by a killer whale (Orcinus orca) consistent with three voice registers. First a few echolocation clicks (M0 register), followed by a call and a “whistle” that are probably in the M1 and M2 register, respectively. Credit line: Olga Filatova, University of Southern Denmark Credit Olga Filatova, University of Southern Denmark. Usage Restrictions w creidt License Original 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.