You're probably right, I'm too optimistic. Perhaps the better model is army ants, or driver ants. I read they will sweep through a village and kill or drive ou

You're probably right, I'm too optimistic. Perhaps the better model is army ants, or driver ants. I read they will sweep through a village and kill or drive out roaches, spiders, mice, and other vermin. The human inhabitants welcome them. Like all ants and termites, they're individually dumb, but the colony can accomplish a lot. So maybe the answer is thousands of one-inch crawling robots which bite anything that moves.