Back in March I started my first flock with thirteen chickens. Recently flies have taken over my acre yard. Their horrible!!! I cant even stand to sit outside, let alone have a cook out at the pool =( You can see hundreds hovering over the grass and they fly away as you walk by. I have never had a problem with flies. I let my chickens free range for a few hours before dark every evening. So I am thinking the fly problem has come from having chicken poop all over my yard. Any suggestions on how to get rid and prevent the fly invasion?!!