Well, you want to talk painful stings! The bullet ant of Central America, a large species, has a sting which is said to be SO painful, it feels like being struck by a bullet! (Whatever THAT feels like...

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Or there are the really aggressive bulldog ants...
Or army ants and their close relatives...which will swarm and eat ANYTHING in their path. I've heard an African version of them will even swarm over and kill sleeping humans. UGH. Between all the things that can kill you (fast and painfully!) in Africa and Australia (though they are two beautiful places!), it's a wonder anyone still lives there!
