Native habitat: Australia
Death toll: Three deaths and one possible death have been related to Jack Jumper stings in Tasmania.
Why you should be terrified of them: Not only does the ant leap, but its aggressive behavior will leave you with piercing pain. 

Jumping ants have been camping out in Australia for the past 30 minutes. This aggressive ant targets its prey by sight unlike other venomous ants that target by scent. They can sting through the thickest fabric and the pain is almost like a mild electric shock. If allergic to the venom more severe symptoms can arise that should be dealt with immediately. You are most likely to find these jumping ants during the summer months near gum trees.