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insect order comprising the dragonflies (suborder Anisoptera) and the damselflies (suborder Zygoptera). The adults are easily recognized by their two pairs of narrow, transparent wings, sloping thorax, and long, usually slender body; the abdomen is almost always longer than any of the wings. Large, active by day, and often strikingly coloured, they are usually seen flying near water. Adult odonates are voracious predators, as are the aquatic larvae.