Or do they work well? Living in the buggy South, we have flies, but this being our first summer with adult free-ranging chickens, well, the flies are horrible. I know about the air fresheners in the coop, DE, fly traps and fly tape, but I would like to know specifically about fly predators. We have cats, chickens, and a dog, but no horses, sheep, goats, or any other larger animals. The ads make them sound great, of course. . . just curious if they'll solve the problem, or knock it down by a large percentage.