KyCoop
Songster
String masons string across their area. Its inexpensive and it works. It has to be replaced every year as it breaks down from weather but that's not a big deal. I will tell you if you do use this method and it comes time to replace it, give yourself time to take it down and put it right back up! Leaving it down rings the dinner bell for the hawks. We have had them land on the fence as we were working hoping to grab a quick snack.
Of course it's not 100 percent fool proof but it's better then nothing.
Of course it's not 100 percent fool proof but it's better then nothing.