We thought it would be good to continue putting birdseed out for them. People often say they see robins feeding in the birdseed. Sometimes seeing isn't believing. If you look really closely at robins at a seed feeder, you see they aren't eating seeds. Birds of a Feather Flock Together. . .
People do it too.
We call it personal space, and scientists call it individual distance. Get with a partner and stand six feet apart. Take tiny steps towards each other until you no longer feel comfortable getting closer. Now measure your the distance apart. They thought the robin looks bigger and fluffier partly because it actually has more down feathers than it does in the summer, and partly because it has those down feathers fluffed out for better insulation.