I'm sure there are a lot migrating due the recent cold front.
I remember flintlock hunting after Xmas a couple seasons ago and it was single digests and a flock of Robin's a d other small birds were hammering grapes in a thicket. I was a little worried that the sound of stuff dropping wasnt just twigs and grapes lol!
I'd imagine as long as there food they stick around in the woods. People just don't see them in their yards like in spring