Robins, like most of our North American migrant species, continue to migrate as they have for generations, although the timing of that migration and the range over which it takes place are never set in stone. Some birds delay their migration for local weather patterns, and many species are responding to longer-term climate change. Robins tend to gather in flocks for the winter, roaming in search of berries and other food sources. For many years they have been extending their winter range northward--if you live in a state in the northern U.S., overwintering robins may be a novelty, many months before the time of the proverbial "first robin of the spring."
Robins, like most of our North American migrant species, continue to migrate as they have for generations, although the timing of that migration and the range over which it takes place are never set in stone. Some birds delay their migration for local weather patterns, and many species are responding to longer-term climate change. Robins tend to gather in flocks for the winter, roaming in search of berries and other food sources. For many years they have been extending their winter range northward--if you live in a state in the northern U.S., overwintering robins may be a novelty, many months before the time of the proverbial "first robin of the spring."