Commonly found in standing waters (lentic systems) or slow-moving running waters (lotic systems), these fierce underwater predators remain one of the most fundamentally aquatic insect orders, with all known North American nymphs spending their young lives underwater. The Odonata can be divided into 2 suborders: the Anisoptera (the dragonflies) and the Zygoptera (the damselflies). Nymphs are distinguished by their large eyes, wing pads on the thorax, and an elbow-like “lower lip” or labium, which can project from the head to strike/seize prey or tuck neatly under the head when not in use. Dragonflies are known for their stout bodies, heads narrower than the thorax and abdomen, and three short, wedge-shaped structures at the end of the abdomen. Damselflies, meanwhile, exhibit slender bodies, heads wider than the thorax and abdomen, and three long, leaf-like caudal lamellae at the end of the abdomen that can facilitate gas exchange.