Jack jumper ants are carnivores and scavengers. They sting their victims with venom that is similar to stings of wasps, bees, and fire ants. Their venom is one of the most powerful in the insect world. Jack jumper ants are proven hunters; even wasps are hunted and devoured. These ants have excellent vision, which aids them in hunting.
The symptoms of the stings of the ants are similar to stings of the fire ants. The reaction is local swelling and reddening, and fever, followed by formation of a blister. The heart rate increases, and blood pressure falls rapidly. In individuals allergic to the venom (about 3% of cases), a sting sometimes causes anaphylactic shock.[1] Although 3% may seem small, jack jumper ants cause more deaths in Tasmania than spiders, snakes, wasps, and sharks combined.[2]
Safe to say I think Tasmania has more toxic critters per square kilometer then any place on earth.