When will the bird change hair?

Birds usually start changing hair before summer and winter.It will change the hair twice a year. The first change is to ask for puppets. Usually only a part of the change. This part is also called a wedding feather.The second time changing hair is for the winter. The feathers are inevitable for a year. This is inevitable that it is not good for the birds in the winter, so you need to change the new hair.When changing hair, you must pay attention to windproof and improve feed.