Where are the sparrows hiding in winter

In winter, sparrows are used to hiding in their own nests. Generally, nests are built on human houses, and some will be in tree caves.Before the winter, they often eat themselves into a fat man, so that they have enough energy consumption to allow them to spend winter.Winter movement is less, and feathers will become fluffy, so that the air can be accommodated, thereby forming a good heating layer and resisting the severe cold in winter.