How do I tell the male and female

Brother Xun wants to distinguish the width of its mouth, and the males are generally wider than female.At the same time, you can also look at body shape, usually males.In addition, if you observe the head, you can also find that the female head is smaller than the male, and the shape is different. The female is smoother, and the male is more square.In the end, their feathers are also different, and the male birds look lighter.