What do you think of waxing birds?

If you want to know the age of waxing birds, you can look at its claws. The old bird is longer, and the toenails of the young bird are short.In addition to looking at the claws, it can also look at its skin. Usually the skin of the young birds is very tender, the color is more pink, the skin of the old bird will be thicker, and it will be white.And the color of the young bird's feathers is more bright, the feathers of the old bird should be messy, and the color is dark.