Common darter, horse-stinger, black-tailed skimmer tinged purple and green—you and your keen-sighted clouds of armies can make swift work of marauding monkeys. Remember, in prehistoric times, you were the largest flying insect, ever. Old tales warn: don't fall asleep on a damp riverbank, lest the devil's darning needles sew your human eyes shut. Free-moving, water-dwelling nymph, you live underwater more than a day, until it's time to moult— that process when the skin splits and we wriggle, flimsy, into what we've been given as wings.