I am having some serious issues with flies in my chicken coop. I'm in Italy and the summer days here are incredibly hot! What can I do to ward off all of these flies? The coop doesn't smell bad and I clean it twice a week. They dont seem to bother the hens but they are annoying and I just hate flies with a passion!
However, can flies create health hazards for my chickens, like in their water and food? Thanks in advance!

