Having grown up in that part of the country, there are two tricks the Pa
Dutch use to get rid of sparrows, and crows, 1.  Get an old stuffed owl and
put it in a nearby tree, 2. get a snake, real or otherwise, and put it on the
ground near the birdhouse.  If you get real snake, build rapport with the
snake and train it to bring in other snakes to get away from your AO.