I am being over-run with ants. You can't stand still in the chicken yard without being biten by them. The chickens seem miserable and try to sit on tree limbs I have cut down for them to rest on. It is so bad, I need to find out what to put down to kill the ants that won't hurt the chickens. I have a pretty good size chicken yard that is fenced in. I put down some poultry dust, it helped a few days but the ants just came back again. Any suggestions???? Despret