Dragonflies have long been considered a sign of good luck — and it seems with good reason. Much like hummingbirds, dragonflies are quite agile. They can fly both forward and backward with lightning speed, and can hover, dart, or change direction with ease. That aerial agility makes dragonflies highly efficient carnivores, with voracious appetites that help keep fly, gnat, and mosquito populations in check. They have even been known to snatch winged termites as they fly out of the ground.