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The gray bird's tail fur fell off, indicating that it is necessary to change the hair, and you must pay attention to supplementing nutrition.This bird is usually changed from May to July each year and changes once a year.When changing hair, feed some foods with high nutritional content to promote the growth of new feathers.At the same time, we must sweep the bird -raising cage every day, otherwise it has a decrease in resistance after hair removal and it is easy to get sick.