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托福听力练习-科学美国人60秒:感性经验

2017-04-05 10:14:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：感性经验

　　科学美国人60秒听力练习：感性经验

　　科学美国人60秒英文文本

　　Here's one way bats might get their next meal: by eavesdropping on flies having sex.

　　Bats eat a lot of seemingly undetectable flies. To find out how the winged mammals find the insects, researchers set up a video camera inside a cowshed that was home to a bat colony and lots of bugs.

　　The video showed that bats rely on their echolocation skills to detect flies at a specific time: when they're engaged in rather noisy sex.

　　Flies are usually quiet in bat territory and sit on cluttered ceilings in caves where background noise masks the echoes from their movement.

　　But when flies are feeling frisky, males can't help but flutter their wings, emitting a burst of click sounds that the bats pick up on. During more than one thousand sexual encounters caught in the act on video, five percent of the insects were caught in the act by bats. The research is published in the journal Current Biology.

　　The study shows that ignorance can be safer than carnal knowledge when predators are on the prowl.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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