From 1964 - The Girl who Spoke to Dolphins. https://www.youtube.com/watch?v=hnVAv77gEqo https://www.youtube.com/watch?v=hnVAv77gEqo You can hear an attempt by

From 1964 - The Girl who Spoke to Dolphins. https://www.youtube.com/watch?v=hnVAv77gEqo https://www.youtube.com/watch?v=hnVAv77gEqo You can hear an attempt by the dolphin to mimic. Very unclear though. Perhaps the whole doco has better examples.