Surprisingly, once the birds have mated, the female leaves. She does not use the bower for her nest. Instead,
she builds her own, high up in a nearby tree. Her nest is
quite plain. It is not meant to attract attention. That way, the
eggs will be safer. It is less likely they will be 7
The young will have more of a chance to survive.

As far as I know, most – but not all – build their nests after breeding. For most of them, it would be a waste of time and energy to build something they were not going to use. However, for some birds nesting isn't necessarily a matter of common sense. In some species building a nest is part of the courtship process,In many species the male bird's skill at nest building is a sign of his suitability as a mate; he invests huge effort in the task. Males of the European house wren build up to 12 nests to attract females. They will continue to build new nests until a female is happy with the construction.

Explanation:

i believe the answer is d

1)a

2 b

3 d

4 d or b

explanation: