The reason why cuckoo does not hatch eggs

It is normal for azalea to not hatch eggs. This bird does not have the habit of hatching eggs.This bird will produce its eggs into the bird's nest of other birds. The shape of the bird egg is very similar to the owner's bird eggs. In order not to be discovered, it usually takes one.And its chicks will hatch early than the owner's egg. At this time, it will launch all other bird eggs, so that it can enjoy the righteous care.