The reason why the yellow waist will not hatch eggs

The yellow waist willow warrior does not hatch eggs. It is usually not very good for birds.This kind of bird is pairing from late May. After successful, find the place where the camp nest is found, and the nest is usually built on the branches, and the overall is spherical.After 1-2 days after the camp nest, the female bird will lay eggs. One will produce 1 per day. There are 4-5 pieces per nest. The eggs are white jade, with red-brown spots on it.It takes 10-11 days to hatch.