We woke up yesterday morning to a house full of ants, there were hundreds of them. We found where they were coming in, and sealed up all the crevices. Then last night at bedtime I noticed hundreds of ants again! I was up till three oclock in the morning vacuuming up ants and finding a new entry. I did, so I plastered that too, then sprinkled boric acid all along the outside. So far, so good. Yes, we have an ant problem, and outside you can't sit on the ground anywhere. I don't know what to put down in the yard that won't hurt the chickens. I don't know what to fertilize with that won't hurt the chickens. Suggestions?