What's wrong with the tail hair?

The tail hair was lost because it was changing the feathers.The feather change period is a period of 鹧鸪 every year, usually in spring and winter.In addition to the periodic change of feathers, the birds will also experience a change of feathers in the process of growth, fading the fluff on the body, and growing feathers.Pay attention to supplementing nutrition, especially protein and trace elements, and do a good job of health.