What's wrong with the fluffy of the bird's feathers

Hibari feathers are fluffy because of the cold climate.In winter, we must keep warm. If it is a round cage, you can use a cage cloth to put it up. This can achieve warmth. If it is a square cage, it also needs to cover it with a carton to prevent the wind from being blown by the wind.Daily feeding still needs to be continued. As a constant temperature animal, it must eat enough food in any season to maintain heat. It is best to use warm water if you provide drinking water. Do not feed it cold water.