What do you think of Gray Bird?

If you want to know the age of the gray bird, you can look at its feathers and paws. The old bird's feathers are messy, and there are many leather on the paws.The young bird's feathers are much bright, and they are also softer. The paws look tender and will not be as white as old birds.In addition, their toenails are not the same. The toenails of the young birds have not become very long, and the old bird's toenails will not be short.