How to look at the age of cuckoo

The age of azalea is generally reflected in feathers and skin. The feathers are bright birds, and old birds are dim.On the skin, the skin of young birds is tender, and the skin of the old bird will have keratin and white.There are 10 kinds of azaleas. There are certain differences in the size of different types of birds. It is usually not easy to see in the wild, but it can hear its sound. Its calls are loud and frequent.