Killer whales are known for their haunting songs consisting of complex whistles and clicks, but they can also learn "dolphin speak," a new study finds.
Most animals communicate with innate sounds, such as the barking of dogs and the gobbling of turkeys. But some species, humans, for example, can imitate new sounds and learn how to use them correctly in social situations. This ability, called vocal learning, is one of the foundations of language.
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