So today I was in the coop, all the girls and Ancona ducks outside and flies were well not uncontrollable but annoying see that I clean in there and tidy up every day. So I have glue strips hanging from the ceiling and they catch a tone but you smack them, hit them, etc. I keep door open during the day to air out after I turn their bedding over. So I said to myself, self I said...fix the windows with the screens , which I did, then I said well enough air with windows, keep main doors closed and used the electric tennis rackets and cleaned them all out in about 10 minutes ......I hope everyone uses these, flies drop to ground, chickens eat nice Organic flies..