Which of the following birds do not build a nest of its own?

Question

Accepted Answer

The correct answer is **2. Koel**.

### Explanation:

The koel (Eudynamys scolopaceus) is known for its unique breeding behavior. Unlike many other birds, the koel is a brood parasite, which means it does not build its own nest. Instead, it lays its eggs in the nests of other birds, particularly those of the crow family. The koel's eggs are often similar in appearance to the host's eggs, which helps to ensure that the host birds do not reject them. Once the koel chicks hatch, they are typically raised by the host parents, who may not even realize they are caring for a different species.

### Analysis of Other Options:

1. **Crow**: Crows are known for their intelligence and they build their own nests. They typically construct nests using twigs, grass, and other materials, and they are quite skilled at it.

2. **Sparrow**: Sparrows also build their own nests. They usually create nests in sheltered areas using grass, feathers, and other soft materials to provide warmth and protection for their young.

3. **Bulbul**: Bulbuls are another group of birds that build their own nests. They often choose shrubs or trees to construct their nests, using various materials such as twigs, leaves, and grass.

### Conclusion:

In summary, the koel is the only bird among the options listed that does not build its own nest, making option 2 the correct answer. The other birds—crow, sparrow, and bulbul—are all known for their nest-building behaviors.