In the 3 years I lived in Alabama we had a non-stop ant invasion starting every summer. They would come through the ceiling and walls. No matter what I did or how many I killed they couldn't be beaten. Terro worked well but when you have millions of the suckers a little poison isn't going to stop them from regrouping. I'd go out in the yard and find ant hills all over. It was horrible. It is amazing how such a tiny bug can be so powerful because of the numbers.