What's wrong with the tail hair of the Bird's Tail

The bird's tail hair was lost because it was going to change the hair.This kind of bird will change twice a year, which is in the summer and winter.It is best to give it some nutritious foods during the hair change, so that new feathers can grow better.In addition, keep the environment in the cage clean and hygienic, do not have dirty things.At the same time, it is best not to take a bath when changing hair, so as not to catch a cold.