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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Have you ever run into a former acquaintance and discovered that you can't remember his name?
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3 .This awkward situation is apparently alien to dolphins, who can recall old companions up to two decades later.
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4 .As a recent 60-Second Science podcast explained, dolphins have signature whistles that may serve as individual names.
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5 .But how long do they remember their friends' titles?
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6 .To find out, researchers looked at 43 captive dolphins that have moved among the same six facilities, living together in different combinations at various times.
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7 .When the scientists played unfamiliar signature whistles for each dolphin, the test subjects quickly grew bored.
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8 .But when the dolphins heard recordings of the signature whistles of former companions, they moved towards the speakers and even whistled back at them.
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9 .The study is in Proceedings of the Royal Society of London B.
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10 .Not even a separation of 20 years could dim the memory of one particular dolphin,
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11 .which suggests these mammals may have lifelong social memories.
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12 .Perhaps it's time to change the old axiom about elephants to "a dolphin never forgets."
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13 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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