The American Robin is semi-migratory (populations edge southwards), and can be found almost anywhere in the US in wintertime. Here, our winter Robins are probably Canucks, while our local summer breeders are probably in South Carolina.
In the northern US, they live on old berries and fruits in the winter, usually foraging in flocks. Sometimes they get drunk on fermented rotten fruit. They do not eat bird seed.
This pic was from a reader a while back, taken, as I recall, in Lenox, MA: