(Scientists already know that killer whales "speak" using a series of clicks, whistles and pulses, and different groups develop their own significantly distinctive "dialects". The Smithsonian reported that in some cases, the difference can be likened to that of the difference between Greek and Roman. In this particular study they found that killer whales began to sound a lot like the bottle nosed dolphins they were socialized with.
Dr. Luke Rendell, a lecturer in biology at the University of St. Andrews said, "It is yet another confirmation that learning is central to how killer whales acquire their vocal repertoire, and further confirms the status of the *cetaceans as one of the few groups of mammals to have evolved true vocal learning".