 One of my favorite 50s science fiction movies is Them. And what about those giant ants? Is there any type of gas we could use? No, we can't take a chance. It might poison the whole city. Which is being invaded by a slew of giant ants. Kate Chapman says normal-sized ants are a big enough problem, of course. In some cases, folks just do not want any ants around a cookout or picnic. No tolerance for them, but it's really hard to keep them totally away.