Deathstalker Scorpion

Considered the “world’s most lethal scorpion,” the deathstalker more than earns its name. Not only is its poison dangerous for adults and deadly for children and older people, but it moves startlingly fast, too—at about 130 centimeters per second. Watch out for these small but stealthy creatures when in Northern and East Africa (and, if somehow you do run into them in the United States, be warned: the anti-venom to combat their poison has yet to be approved by the FDA here).