What's wrong with the rhododendron tail hair?

The rhododendron tail hair fell off and explained that it was changing hair.Changeing hair is a normal physiological activity of birds, and cuckoo is no exception. There are many types of it. The time for changing hair is usually spring or autumn.Usually it will fade first, and then grow new hair. Do not change the feed when hairy fades. When you grow new hair, you can feed some oily feed to increase the brightness of feathers.In addition, don't take a bath during the hair change.