How to distinguish the male and female

There are many ways to distinguish between male and female.The first is to look at the feather color. Generally, the center of the male bird's head is black, the lower body feathers are yellow and white, and there are brown stripes.The top of the female bird is dark green, the lower body is pale yellow, and there is no stripes.Secondly, you can look at the appearance. The small body is male bird, and the female bird is big and short.In addition, male and female birds are different, and males are better.