They are a species of dragonfly and are most recognizable for their striking green coloration. The male features blue along the sides of the abdomen while the female features a greenish-gray. The male also has an eyespot on the head, giving it the appearance of a cyclops.
They are almost always found near water sources. Females will slightly bend their abdomens over water and insert an egg, one-at-a-time, into the stem of an underwater plant. The eggs hatch and young naiads (juveniles) emerge, looking more like tiny lobsters than darners. They live underwater and feed on tadpoles, other aquatic insects and tiny fish until they grow and develop. The naiads then crawl out of the water and morph into their adult selves. Adults eat mosquitoes, flies, midges, wasps and other flying insects, helping to control the population sizes of what many people consider pests.