Question

why does cuckoo cannot build nest​

Answer 1

Answer:

The common cuckoo does not make a nest of its own, and they do not bring up their own young. Instead, the female lays her eggs in the nests of other birds. ... If the cuckoo lays her egg in the nest before the other bird lays, the reed warbler will notice and knows it is not her egg, and so she will get rid of it.

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Answer 2

Cuckoo bird shows brood parasitism ,it lays eggs in the nest of other birds.
Example:Crow