How to divide the crow

The mother -in -law of the crow mainly looks at the color of the wings. There are more blue on the wings of the male birds, and it is very wide. If it is a young bird, the overall color is red.You can also look at its eye sand. The male bird is blue and the mother bird is yellow.This kind of birds are distributed in various places. There are many subspecies in my country, and the feathers have changed a lot. As forest birds, they can rarely be seen in the plain.