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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber. This'll just take a minute.
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2 .Many animals use sounds to convey information.
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3 .(Sound of wolf howl)
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4 .Humans use particular vocal labels for objects and for people.
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5 .We call these words, and names.
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6 .A few creatures, such as dolphins and parrots, can learn specific vocal labels.
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7 .And wild dolphins are known to have particular, individual signature whistles.
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8 .Scientists at Scotland's St.Andrews University wanted to know: can these whistles be used as labels?
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9 .The researchers analyzed sounds from dolphins off Scotland's east coast, and extracted these signature whistles.
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10 .Then they altered the sounds so the calls wouldn't sound exactly like the originating dolphin.
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11 .They played those sounds back to the dolphins, along with whistles from dolphins familiar to the animals and whistles from strangers.
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12 .When the dolphins heard their own signature whistle, they routinely responded with that same sound.
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13 .That reaction only happened twice when they heard sounds from their pals and not at all when they heard the alien dolphin.
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14 .The research is in the Proceedings of the National Academy of Sciences.
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15 .The researchers think dolphin signature whistles serve as self-identification, and maybe even as a label for addressing each other, just like a name.
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16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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