I never had a problem with flies until today. They're all over the run. It's nasty! I've also noticed the chicken poop is stinkier than usual. I rake the run once a week and on occasion I sprinkle on some DE. Is the poop stinkier because the hens are almost laying (they're 20 wks old and have been singing the egg song)? Are there more flies because of the stinky poop, or is it just because it's August? Anything I can do? Are the chickens in danger of illness or a parasite infestation because of them? Thanks!