Okay, it wasnt as bad last spring, but this spring I am noticing a lot of small nat-like flies around my pen (not so much in the coop). I just put lime down for the first time also. My question is what do you all do about the flies? ANd, if you put lime down to help control the pen, how much do you use. ...oh, and any ideas for controling the "scent" associated with the chicken's pen??? Thanks!