What's wrong with the four happy bird tails?

The four happy bird tails fell because it was about to change the feather.This kind of bird's hair change is generally in July each year. After the hair changing, you must pay attention to windproofing, and at the same time do a good job of sanitary work. In addition, some feed with high nutritional content must be provided to promote the growth of new feathers.In addition to changing feathers, the disease can also cause birds to lose hair. At this time, you need to understand the condition and make the corresponding treatment.