Birds are starting to head south these days, even raptors. If you don't have any homesteading hawks already, you're gonna see the migratory suckers over the next couple of months. If you get netting make sure it has small holes, like 2x2 or 3x3. Juveniles can get through any bigger than that.
In some states it IS legal to kill nuisance animals. I know here in Tennessee it is legal to kill the migratory geese that decided to stick around and caused enough monetary damage. You have to contact you local wildlife management agency first. They may say no anyways. I may ruffle some...