Lol, I used to run a hatchery inside the city limits, there are ways.... But that was a long, long, long, LONG time ago.
Believe it or not, a dog can be the best deterrent if you can get it excited about chasing that kind of bird. Just don't ever let him actually catch it, that beak will break skin (or so I've heard tell...
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Another method that works middling to fair is to run a hot wire, usually takes two or three to make sure they get zapped when they walk in. Motion activated lights work good (actually better than motion activated sound, and easier on the relationships with the neighbor). Hand held laser pointers if you have too much time on your hands.
