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SSS 2011-01-19

时间:2011-02-11 06:42来源:互联网 提供网友:qi2261   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

It's one of the oldest moves in teen dating. Head to a scary movie. As soon as the scary music kicks in, your date cuddles closer for comfort. Well, some birds may have the same idea. Splendid fairy-wrens2 are small, sexually promiscuous3 birds native to Australia. It turns out that males get the attention of potential mates by making their move after a predator4 announces its presence. The research was published in the journal Behavioral Ecology.

That's the sound of butcherbirds, which prey5 on splendid wrens. Every time male wrens hear that cry, they sing this in response. Researchers say the calls become layered atop one another, almost like a duet.

The scientists tested the response of female wrens by playing recorded bird calls. They played just the male fairy-wren1 call. Then they played the trill of the wrens singing immediately after the butcherbirds. The females became significantly more alert—looking to the sound or singing in response—after hearing the two calls together than they did if they heard just the wren. And so for both teens and wrens, a bit of fear might help a guy get the chick.

Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.


点击收听单词发音收听单词发音  

1 wren veCzKb     
n.鹪鹩;英国皇家海军女子服务队成员
参考例句:
  • A wren is a kind of short-winged songbird.鹪鹩是一种短翼的鸣禽。
  • My bird guide confirmed that a Carolina wren had discovered the thickets near my house.我掌握的鸟类知识使我确信,一只卡罗莱纳州鹪鹩已经发现了我家的这个灌木丛。
2 wrens 2c1906a3d535a9b60bf1e209ea670eb9     
n.鹪鹩( wren的名词复数 )
参考例句:
  • Other songbirds, such as wrens, have hundreds of songs. 有的鸣鸟,例如鹪鹩,会唱几百只歌。 来自辞典例句
3 promiscuous WBJyG     
adj.杂乱的,随便的
参考例句:
  • They were taking a promiscuous stroll when it began to rain.他们正在那漫无目的地散步,突然下起雨来。
  • Alec know that she was promiscuous and superficial.亚历克知道她是乱七八糟和浅薄的。
4 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
5 prey g1czH     
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
参考例句:
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
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