Bottlenose Dolphins use motherese, or baby talk, when communicating with their calves, according to a study published in the Proceedings of the National Academy of Sciences. The study found that mother dolphins changed the tone of their signature whistles when addressing their offspring. The use of child-directed communication is believed to enhance bonding, attention and vocal learning, but researchers are unsure of the function of baby talk for dolphins. The study found similarities between dolphins and humans in terms of vocal production learning.

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