Black-capped Chickadee (Poecile atricapillus) irruption
There have been Black-capped Chickadees (Poecile atricapillus) moving south in very subtle ways for a couple of months now. If you watch migratory hotspots you can sometimes detect their irruption years, especially if that location is not a particularly friendly habitat for the species. I have seen flocks of 10-20 birds tightly packed together and feeding on the move, possibly heading for a feeding station like yours. I always wonder what particular triggers end up notifying a widespread and highly adaptive bird like this one that they should nonetheless change their quarters for the autumn...
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