How can Hibari warm in winter

Hibari needs to cover the cage cloth in winter, so that it can keep warm and pay attention to windproof.This bird is a small ring poultry. The appearance looks like a sparrow. It usually eats the seeds and insects of plants and likes cluster activities.The male birds will sing during the breeding period, to attract the opposite sex, and then prepare for the nest to lay eggs.It is distributed in the north in my country, such as Xinjiang, Hebei, Shandong, Heilongjiang and other places.