Crying Migratory Bird

In the cold winter, migratory birds form groups and migrate towards warmer distances. Keeping warm, avoiding cold, and staying away from harm are the survival motto of migratory birds. Many times, so do people. Flying tired wings, flying in a fixed and warm direction, like a moth flying into the fire, persistent and tragic. In those long and cold days and nights, I will be shaken and frightened like a frightened bird! Has anyone seen the tears of migratory birds flowing in the blue sky, like white feathers flying silently?