What's wrong with the peony parrot tail hair?

The peony parrot tail hair fell off indicating that it was in the feather change period.This bird does not have a fixed feathers, usually changes twice a year, once in spring, and the other in autumn.When changing feathers, pay attention to supplementing nutrition, so that new feathers will be healthier and softened, and at the same time, we must keep environmental hygiene, otherwise birds will be easy to get sick.In addition, the hair loss of the tail may be infected with parasites, it is best to check it.