萤火虫能发光，并不是随身带着小灯笼或者手电，而是它们的尾巴上有一个像发光器一样的器官。萤火虫吸入空气，发光器里的物质遇到空气就会发出光来。由于萤火虫有时吸入的空气多些，有时吸入的空气少些，使发出的光一会儿明亮，一会儿暗淡，这样看起来就一闪一闪的啦！
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