What's wrong with the fluffy of yellow bird feathers

The yellow bird's feathers are generally because of cold.Usually, in winter, you should take warmth measures. You can put on a cage outside the cage, but leave a stitter.Don't put it at the air in order to prevent the birds from being blown by the cold wind.Feeding is the same as other times. It mainly uses corn flour, mung bean flour and egg yolk, and can replenish vegetables on a regular basis to maintain a balanced nutrition.If you take a bath in winter, you must wash it at noon and wash it once a week.