Be REALLY careful with sticky fly strips! If you have flyers, you'll have issues. Most likely, no one mentioned them because, in a coop or run, they collect more dust and feathers than flies. It's also impossible to get them off of chickens ... or to get chickens off of them! Even worse , if your coop/run doesn't have REALLY high ceilings, you'll end up with that evil mess in your hair. The only way to get it out is with scissors!I was reading thru this and wondered why no one mentioned the sticky fly strips, and here you are. I have used these for years, hang them from the rafters, when they are almost full just dispose them in a plastric bag. Works great and cheap, you can order them from Amazon if you cannot find them. I also use a drop board and clean it every day, really helps with the fly problem.

I've found the best way to get rid of and prevent flies is - as many have suggested - to dry out the run. One of the best, easiest and inexpensive ways to soak up the moisture is to dump a few bags of horse bedding pellets in there. As they absorb the mess, the pellets swell and break down into sawdust - totally non-toxic to your birds and good for composting if you ever need to shovel the stuff back out. Toss in some wood chips and a few evergreen branches (let your birds spread them around for you) and you have instant , natural organic flooring!