How to divide the father and mother

The gray swallow is to be divided into mother -in -law. You can first look at its hair color. Generally, the color of the male is more vivid, the abdomen is whiter, and the mother looks plain.In addition to the difference in the overall, the details are different. For example, its eyebrows, the eyebrow's eyebrows are white and long. The eyebrow lines extend to the back, and they will be connected in the back of the head, and the mother bird will not.In addition, the screams of the male bird are also crisp and loud.