蟑螂是变温动物，也叫冷血动物，这意味着，与人类相比，他们需要的食物非常少。
Cockroaches are also poikilotherms, or cold-blooded, meaning they need much less food than humans do.
和哺乳动物不同，蜥蜴和其它爬虫类是变温动物(即通常所说的冷血动物)，也就是说他们不能调节自身体温，因此当环境过热时他们必须寻找阴凉处栖息。
Unlike mammals, lizards and other reptiles are cold-blooded, meaning they can't regulate their body temperatures and so must seek shade when it gets too hot.
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