What is a collective noun of young birds?

There isn't one specific collective noun for young birds. "Brood" is often used, but it applies more to the young of a single bird pair.

Here are some other options depending on the context:

* Flock: This is a general term for a group of birds, and it can apply to young birds as well.

* Clutch: This term specifically refers to a group of eggs or young birds hatched at the same time.

* Nestlings: This term emphasizes that the birds are still in their nest.

* Hatchlings: This term describes very young birds that have just emerged from their eggs.

The best collective noun to use will depend on the specific situation and the type of young birds you are talking about.