How to distinguish between Blue Birds

There are many ways to distinguish between Blue Birds.First of all, look at its oral cavity. Generally, when the birds are hungry, they will open their mouths. If the mouth is red and the throat is relatively large, it means that it is a male bird. If the redness is yellow and the throat is small, it means that it is a female.In addition to this, you can look at the wings. There are 6-12 white feathers in the male flying feathers, usually with a certain luster, and the female white feathers are less than 6, and they are not very light.