Dolphins use their vocal signals to [[communicate]].
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Some dolphins have their own whistle sound that they develop when they are one years [[old]].
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When these dolphins are lost they produce their whistle sound. They also call their friends by mimicking their [[whistle sounds]].
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Dolphins make clicking sounds for communication and to [[locate objects]].
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By making clicks dolphins can make a map in their heads about where things are. These echo location signals allows dolphins to figure out where objects are from the echos they [[hear]].
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Dolphins can also release several clicks at once which is called, burst pulses. Dolphins release these signals when they are [[excited]] or [[angry]].
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A specific signal is used when dolphins want to play around [[with]] their friends.
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Another signal is used when a mother is angry [[with]] her misbehaving calf.
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Dolphins have their own language to talk to one another using sounds.
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