I put up an earlier post back in May on what to do about mosquitoes. https://www.backyardchickens.com/forum/viewtopic.php?id=507169 They are so bad her up in the north (I live in Michigan) that it had been not only unbearable for the chickens, but also for us human folk. My two little girls are like little indians and LOVE to play outside. I have been spraying my poor children with "Deep Woods Off" with the highest content of deet. Guess what....mosquitoes had been biting through that! Aside from giving us "humans" some relief from the nasty blood suckers, and allowing us to enjoy the outdoors in this short summer season, I was worried about the chickens while they slept at night when the mosquitoes were at their worst (as if the day time wasn't bad enough). I received all kids of suggestions in my previous post from vanilla extract (which just made us smell delicious but no deterrent to mosquitoes), to catnip oil, purple martin houses and bats. Well I have found THE solution. We no longer need to use ANY insect repellant on ourselves and there is not a SINGLE mosquito on our treated portion of property. We live on 5 acres, but I treated all the manicured area around our house, coop and pool (20,000 sq. ft.). I got it from TSC. It's called "Wisdom TC Flowable". It is a liquid that you spray on your lawn using a liquid fertilizer broadcaster (the kind you attach to the end of your hose). The moment I finished spraying the designated areas, ALL MOSQUITOES WERE GONE! It lasts up to eight weeks. You need to avoid ponds, it will be toxic to fish, and flower beds and vegetable gardens as it also affects honey bees. The active ingredient is Bifenthrin. I was told Wisdom TC Flowable was safe to use around animals and I can now tell you from experience, it is GREAT stuff! I didn't spray it inside my chicken run (which is only 4'x12'), but I did spray the area all around our coop. My chickens do free range when we are outside, and now my human family and my chicken family are ALL able to enjoy the great outdoors COMPLETELY mosquito free. Even at night there is not ONE SINGLE Mosquito out there. When I open my coop early in the morning to let our hens out, I am still amazed that there is never a mosquito inside. Wisdom TC Flowable gets 5 thumbs up from me!! And my girlies (human and chicken) have ALL been mosquito bite free. YAY!!