I heard whistling. It was much more shrill than I’d ever heard coming from my son, but I checked with him anyway. No, he wasn’t whistling. I opened the door and saw the surrounding cypress and pine trees full of birds. The feeder was empty and they were letting me know! As soon as I refilled their bounty the whistling stopped and something akin to air traffic control began to occur as they took turns hitting the ledge for their seeds, flying in to grab a bite then exiting to a bough to enjoy the meal.
I knew we had completely spoiled our german shepherds, (now down to one after losing the oldest in May), and the pair of kittens we’ve been raising when wild dogs killed their mother and siblings at our farm about a mile from our house, but spoiled birds? Apparently!