I like the fly predators too, and due to a mix-up don't have them this year. The difference is obvious! I make sure that the egg cases and the package are out of reach of the chickens, and they do work well. Mary
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I used Fly Predators when I had horses, and it did cut down the fly population by 80%. With them being a bug themselves I was worried the chickens would eat them and I'd be throwing my money away, so this is good to know they work around chickens!