The reason why the gray bird does not hatch eggs

There are many reasons why the gray bird does not hatch eggs, which may be related to themselves, or it may be related to eggs.Before breeding, this bird will generally start the nest, and it will build the nest in shrubs or small trees.It can have four nests every year, with 4-7 eggs per nest. After 16-18 days, the female birds will break out of the shell.It takes a while to grow feathers for a while. When it is 45 days, it will leave the female bird.