[QUOTE=11B10;1120326]Fire ants, wasps, hornets, some scorpions - pretty much anything with a substantial alkaloid as part of its venom. Fortunately, that's mostly insects with these things.
Fortunately, I've never had to stab myself with one of these things. I'm pretty careful to not piss off wasps, hornets, and ants - but fire ants are EVERYWHERE once you get past a certain latitude heading south. Fortunately, they are not found here in Illinois, presently (give it time though).