What do you think of Bai Fan Shanbi?

The age of the white -faced sparrow can be reflected from its paws. The young bird's paws are very tender, without much leather, and the toenails are relatively short.Old birds are not. Its paws will look white, and there are scales on it, and the toenails should be longer.In addition, the feathers of old birds and young birds are the same. The former is often fluffy and messy, while the latter is more soft.