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Transcripts for CNN New Day Sunday 20130728 10:47:00

Britain show similarities between dolphin whistles and the human communication. do these dolphins talk to each other? yes. they do interact with each other vocally. they use sounds to communicate. and what the sounds mean, we don t entirely know. but they know. they know. and i think what is most common with these animals, the sounds aren t a language, it s a vocabulary like what we have. like dogs barking or wolves howling in the forest, that means something to those wolves, that means something to those dog us. and dolphins are very similar in that aspect. reporter: to most it would seem that dolphins are talking to each other, not just barking. when we re under water, it is noisy, there s clicks and whistles and sounds. and because their hearing is built entirely different than our, it s very it s like a charterbox down there. reporter: the fact is they re not using their mouths at all. they don t have vocal chords ....

We Don T , Human Communication , Dolphin Whistles , Sounds Aren T , Lindsey Stewart , Each Other , Buzzing Noises , Vocal Chords Sothy ,