How to keep warm in winter

In winter, the yellow bird needs to cover the cage with a cage and leave a sewing, but do not look at the air outlet, otherwise it will freeze it.This bird is generally living in the mountains and hills. Most of them eat fruits and seeds. They can also eat insects. The sounding sounds are better, so it is very suitable as a pet.It is widely distributed in my country and can be seen in the northeast, Hebei, Shandong, Guangdong, Sichuan and other places.