Dragonfly larvae (nymphs) are aquatic, usually drab, with 6 legs, large eyes, and small wing buds on the back of the thorax. Gills are located inside the rectum (unlike those of damselflies, which extend from the hind end like 3 leaflike tails). They breathe by drawing water in and out of their hind end. By forcefully expelling this water, the animal can move quickly in a form of jet propulsion. The lower jaw is scooplike and covers most of the bottom part of the head.
Adult dragonflies have slender, elongated abdomens, robust bodies, and 2 pairs of wings that are usually outstretched horizontally. The wings are membranous and elaborately veined. The hindwing is wider at the base than the forewing. The eyes are compound, large, adjoin each other and nearly cover the head. The antennae are short. The six legs are poor for walking but good for perching.