What's wrong with the fluffy feathers of the four happy birds

Four -hi bird's feathers are fluffy because the weather is relatively cold.To keep warm in winter, you can put a cage on the cage, so as to avoid it being blown by the wind.Feeding must be fed a little more so that it can be stunned, it is best to feed once or twice a day.To do a good job of cleaning, keeping cleaning in the cage is also helpful for the health of the birds.You can take a bath once a week, but wash it with warm water, which will melt the fat on the feathers and let it lose the effect of keeping warm.