How long will the bird born until fly

It takes about 15 days to be born by the bird.It is generally reproduced in May-July, and the male and female birds will be carried out after pairing. Usually, the nest is built in a branch of the trunk and other trunks, which is 3-5 meters high from the ground.The nest is cup -shaped, with animal hair, feathers, etc., and the outside is dry grass and bark.After the nest is built, the birds will lay eggs. Each nest is 5-7 pieces. The color is green, and there are red purple spots on it.