The reason why Acacia bird does not hatch eggs

Acacia birds do not hatch eggs because eggs are not fertilized.This bird will built the nest under the bushes of the forest or forest edge, and some will be in the bamboo bushes. The nest is generally about 1-1.5 meters above the ground. The shape is deep cup-shaped.Ever.When the birds are built, they start laying their eggs. Usually, each nest will produce 3-4 eggs. The colors are white or green white, and there are purple spots on it.