What's wrong with the colorful bird tail hair

The colorful bird's tail hair fell off to indicate that it entered the feather change period. During the period, pay attention to supplementing nutrition.When it was changed for the first time, it was 3 months old, and it had to go through 4-6 months before it could be changed. After that, it would be changed once a year.When changing hair, if there is something in the cage, it is best to clean up in time to avoid any adverse effects on the birds.