My asshole friend Dave says you can get a pellet gun, or you can get the bird spikes. But you'd be more satisfied with the pellet gun. 40 bucks at Walmart for a decent one, then you go all Lee Harvey on them.
Spikes mean you give the problem to your neighbor. Pellet gun means you solve the problem for everyone.
btw, now that you own a house, you should also own a fiberglass ladder. Pick one up from home depot on your way to walmart.