Why do sparrows ruffle their feathers in winter?

When ruffled between the feathers, cavities are formed into which air enters. And he, as you know, is an excellent conductor of heat.
Sparrows (and other birds) ruffle their feathers to form these air pockets to help keep them warm in winter.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.