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段落1

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

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Many bats hunt at night and use echolocation, or sonar, to zero in on their prey.

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That's slowed down 20 times, so you can hear it.

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But some insects, like the tiger moth, have figured out how to evade that echolocation by jamming it.

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"It makes these ultrasonic clicks in the last moment before it would normally be captured by a bat.

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And this interferes with the bat's echolocation, causing that bat to miss."

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Aaron Corcoran, a postdoc at Wake Forest University.

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Corcoran studied that phenomenon, and says he's now discovered that the jamming strategy isn't limited to prey.

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Bats do it, too, to foil each others' hunting efforts.

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Corcoran and his colleagues recorded Mexican free-tailed bats, Tadarida brasiliensis, echolocating in the wild.

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And they happened to pick up a sound bats made only when other bats were hunting.

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It reminded them of the moth jamming call.

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So they played back that sound to bats hunting tethered moths, in a field experiment.

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And sure enough, bats who heard the bat jamming call while echolocating, were 70 percent less successful at capturing the tethered moth, than bats who heard a generic tone, or no sound at all.

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The study is in the journal Science.

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Of course, if you have a porch light you may be wondering: aren't there more than enough moths to go around?

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But here's the thing.

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"The Mexican free-tailed bat has the largest colonies of any mammal on the planet except for humans with up to a million individuals.

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So yeah, there's a lot of insects out there but there's a lot of bats to compete with, so they have to find ways to one-up each other basically."

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Tricky. A real fly-by-night operation.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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