 The imago (adult stage) has a large head, well-developed, compound eyes, legs that facilitate catching prey (largely other insects) in flight, two pairs of long, transparent wings that move independently, and an elongated abdomen.Many Odonata are relatively large insects, but wingspans range from 17 mm (some "Agriocnemis" damselflies) to 191 mm (helicopter damselfly "Megaloprepus coerulatus".The largest dragonflies have a wingspan of up to 160 mm, but they are much more massive than any damselfly.