What's wrong with the yellow tail hair?

The yellow tail hair fell because it changed hair.This bird usually starts to change hair in late summer and early autumn. When changing hair, pay attention to protection because it is easy to get sick.During this period, it is best to recuperate, do not walk it, do not let it be affected, regularly clean up and keep the environment clean and tidy.In addition, you can feed more green materials, which will help the growth of new feathers.