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A. Cuckoos (布谷鸟) can make different sounds of other animals. B. It's the cuckoo. C. Then cuckoos will go to the nests of those birds. D. You may see them in summer. E. They lay their eggs (下蛋) in other birds' nests. F. Cuckoos like singing at night.

"Cuckoo—cuckoo", did you hear this sound before? Do you know who makes that sound? Cuckoos are birds and they live in the trees in many countries. When can you see them?

Cuckoos are very lazy. They don't make nests for their eggs. It sounds difficult to do so, but cuckoos can do it. They have a special skill: copy the sounds of enemies (敌人) of other birds. When the other birds hear the sounds, they will be afraid and then fly away.

Cuckoos are like the foxes in the forest. Do you think so?