What's wrong with the fluffy of gray swallows feathers

Gray Yan's feathers may be caused by cold climate.As a silk bird, it is more suitable to survive in a high temperature place, so it is necessary to keep warm measures after winter, and at the same time, it must be windproof.Feeding can add some high fat foods to improve its cold resistance.Drinking water should be used with warm water. Drinking too cold water can easily affect digestion.However, bathing should be washed with cold water, and warm water will melt the fat on the feathers, which is not good for its health.