How does the three treasures divide the father and mother

It is not easy for the three treasure birds to divide the mother and mother.It is distributed in the east of Siberia, and it can also be seen in the northeast, North China, and Central China of my country. It will migrate to South China and Southeast Asia in winter to avoid cold.This bird is usually breeding in the tree hole and stone cave. The male and female birds will have a common breeding, and the chicks will not leave after 4 weeks.