I know I sound like I think a rooster is the answer to all troubles, but we had no real predator problems for 4 years when we had a rooster. Once I was forced to re home him, 2 years ago we have had nothing but problems with possums. We have to put out traps everynight once the hens are in bed for the night and we catch possums regularly in the middle of the city. also have had hawks sitting on my fence, one brave little SOB was 15 feet from me.