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段落1

This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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Music is a tough way to make a living.

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Just ask the túngara frog.

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Its song can get it killed.

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Because the motion of its vocal sac when it produces its call also creates ripples in the surrounding water that predators can see.

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To see how rivals and predators respond, researchers built decoys that produced mating calls, ripples or both.

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When rival males heard the song and saw ripples, they doubled their competitive cries.

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But if the ripples came from less than 8 centimeters away, the rivals grew quiet, perhaps preparing to fight or flee.

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Meanwhile, predatory bats preferred to attack when the model produced both audio and visual cues.

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But bats also reacted to ripples alone.

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Now, túngara frogs shut up fast when a bat's overhead.

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But the water's continuing rippling can give the frogs away.

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The work is in the journal Science.

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Seems that some animal communication is multi-sensory,

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and a signal's side effect can have unintended consequences.

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Like turning a love note into a death rattle.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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