Caterpillar
毛虫
Have you seen baby butterflies? Probably not.
你见过蝴蝶宝宝吗?应该没有。
This is because an adult butterfly has never been a baby butterfly.
这是因为成年的蝴蝶压根就不是由蝴蝶宝宝长成的。
Then, how did the adult butterfly grow up?
那么,成年蝴蝶是如何长大的呢?
Butterflies, moths and some other insects once were caterpillars.
蝴蝶、飞蛾和其他昆虫曾经都是毛虫。
![caterpillar caterpillar](http://pic.kekenet.com/2017/0822/80511503394638.jpg)
Caterpillars are born out of eggs.
毛虫是卵生的。
They usually eat tree leaves, but some of them also eat other caterpillars or small insects.
它们通常吃树叶,但它们有的也吃其他毛虫或小型昆虫。
The caterpillars eat a lot, so they are sometimes called "eating machines".
毛虫很能吃,所以它们有时被戏称为“吃东西的机器”。
When caterpillars get old enough, they change their forms into adult butterflies or adult moths.
毛虫长大的时候,它们就会变成年蝴蝶或飞蛾。