How to divide the mother and mother

The mother -in -law and mother are mainly in three aspects.The first is its mouth. Generally, the upper mouth of the male bird is arched, the color is more red, while the mother bird is flatter and the color is lighter.The second is its eyes. The eyes of the male birds are red, and the red circle of the mother bird is not complete, and there will be interval in the middle.In addition, listening to it can also judge the male and female, the public call is coherent, and it sounds more sharp.