We bought some Terro traps cuz I didn't want to put cotton balls everywhere. The traps seem less messy. I just checked the one we put right outside the back door. The ants are swarming it. Maybe we'll kill those off. I put one under the oven, but I can't get to it easily to take a peek. We've only had a few in the kitchen. And I put one under the part of the computer desk that nearly touches the floor. I can't get to that one either. But they're also swarming the one right outside the front door. I figure if I can't get to them, neither can the cats. I pushed them back far enough, they can't be reached with a paw. One of the cats puked the other night and I found it in the living room the next morning just covered in thousands of ants. So I'm hoping I get that nest.