Why do birds come out in the winter when it is cold?

birds migrate during the winter because since us humans also cant stand the cold temperature we buy gloves, hats ect.. that's not what birds do in order to get warm. birds migrate mostly in the winter time because some other animals hibernate in the winter so there's no food left .the migrate to get food in order to live and stay until its winter were they are.

-information from *Amaz!nqq Shorty*