That blur is our tufted titmouse who was packing himself one giant ball of cat fluff. He would pull a bit out and then sit on the tray feeder to pack it tighter and then go back for more. It’s the first time I’ve managed to catch anyone in the act. Our squirrel friend hasn’t yet sussed a way up to the feeder again but I have no doubt he will soon be up there again. I’ve already seen a few very close jumps. He just needs a little practice!