This is a real who-dunnit. It's an apple caper, if you will. My question: how the heck did this half-eaten apple ever get to the top of this birdhouse. Some early responders were: Madge said, "a crow or raven." TexWisGirl commented, "squirrel?" Jack(the jester) replied, "You put it there. Fess up." Come on. Get creative. I think I know the culprit but... make me smile.