"No Ants Allowed!"

We have a minor ant problem that developed yesterday in our kitchen. This afternoon I was killing the ants on the countertop when Gabriel asked, "Mommy, why are the ants coming in our house?" To which I replied, "I think they are looking for warmth and food." "We don't have any food for them, Mommy. I think we should post a sign for the ants. It should say, No Ants Allowed! No Food for You!"