My guess is they have not gone any further south yet, this year. We have many days of very cold weather coming later this week (low 5-10F and highs 25F), so they may need to move on. They are shaped much like Bluebirds (also Thrushes). The bluebirds spend every winter here in the Boston Mountains. Included is a Bluebird picture from yesterday near a canebrake.
for comparison:
Life and Wildlife along the Little Buffalo River 
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