On really cold mornings we've often got a crowd of birds hanging out all around the feeders, staring crossly at our kitchen window. Like a surly gang of teenagers waiting for the Slurpee machine to get refilled at a 7-Eleven, our birds are hungry and p-o'd that we're not out there filling the feeders RIGHT NOW!
Once in a while a male eastern bluebird will perch just outside the deck window and wave his wings at us. It's the same move he uses to impress the "ladies" in the spring when he's showing off the nest boxes in his territory. But he's not trying to encourage us to mate with him (at least we hope not). He's letting us know that we're failing to keep the feeders full of mealworms and suet dough. Yesterday he tapped his bill lightly on the upstairs bedroom window to remind Julie that he and his azure flock were ready to eat. The un-anthropomorphic among us might say he was merely fighting his reflection (sorry, the window was covered in frost) or nabbing an insect (it was 4-degrees out! there WERE no insects).
Nope he was communicating with us. Reminding us of our responsibility as feeding station operators.
Then there's the Carolina chickadee (one of about 40 that we have around the farm feeders). He got so mad at the tiny amount of suet in the suet feeder that he threw a fit. I managed to document his latest fit in photos. See below....