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SSS 2010-01-05

时间:2010-05-20 01:28来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

Sometimes it pays to look like a pile of poop. At least if you’re a tasty caterpillar1 trying to avoid getting eaten by hungry birds. Because a study in the journal Science shows that even young chicks tend to overlook caterpillars2 disguised as dung.

Animals have come up with some pretty clever tricks for keeping themselves off a predator’s dinner plate. Some use camouflage3, adopting colors and patterns that help them blend into the environment. Others masquerade as something inedible4, like bird droppings or twigs5. But scientists got to wondering whether the two approaches are really so different. Maybe critters dressed as twigs also “blend in” so that predators6 just don’t see them. To find out, scientists presented some twiggy-looking caterpillars to two sets of hand-reared chicks. They found that baby birds that had never seen sticks before gobbled those bad boys right up. But chicks who were shown real twigs first took much longer to peck at the mimics7, and did so more gingerly than their naïve friends.

That means the birds could see the caterpillars, but were fooled by the costume, at least temporarily. Which, for a caterpillar on a leaf in the wild, could mean the difference between eating and being eaten.

—Karen Hopkin


 


点击收听单词发音收听单词发音  

1 caterpillar ir5zf     
n.毛虫,蝴蝶的幼虫
参考例句:
  • A butterfly is produced by metamorphosis from a caterpillar.蝴蝶是由毛虫脱胎变成的。
  • A caterpillar must pass through the cocoon stage to become a butterfly.毛毛虫必须经过茧的阶段才能变成蝴蝶。
2 caterpillars 7673bc2d84c4c7cba4a0eaec866310f4     
n.毛虫( caterpillar的名词复数 );履带
参考例句:
  • Caterpillars eat the young leaves of this plant. 毛毛虫吃这种植物的嫩叶。
  • Caterpillars change into butterflies or moths. 毛虫能变成蝴蝶或蛾子。 来自辞典例句
3 camouflage NsnzR     
n./v.掩饰,伪装
参考例句:
  • The white fur of the polar bear is a natural camouflage.北极熊身上的白色的浓密软毛是一种天然的伪装。
  • The animal's markings provide effective camouflage.这种动物身上的斑纹是很有效的伪装。
4 inedible PQQzU     
adj.不能吃的,不宜食用的
参考例句:
  • The food was totally inedible.食物完全无法下咽。
  • These chemicals make the fruit inedible.这些化学品使这种水果不宜食用。
5 twigs 17ff1ed5da672aa443a4f6befce8e2cb     
细枝,嫩枝( twig的名词复数 )
参考例句:
  • Some birds build nests of twigs. 一些鸟用树枝筑巢。
  • Willow twigs are pliable. 柳条很软。
6 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
7 mimics f8207fb5fa948f536c5186311e3e641d     
n.模仿名人言行的娱乐演员,滑稽剧演员( mimic的名词复数 );善于模仿的人或物v.(尤指为了逗乐而)模仿( mimic的第三人称单数 );酷似
参考例句:
  • Methods:Models were generate by CT scan,Mimics software and Abaqus software. 方法:采用CT扫描,Mimics软件和Abaqus软件的CAD进行三维有限元模型的创建。 来自互联网
  • Relaxing the mind and body mimics the effect that some blood-pressure pills would have. 放松身心会产生某些降压药才能产生的效果。 来自辞典例句
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TAG标签:   SSS  caterpillar
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