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A dragonfly is a winged insect belonging to the order Odonata, the suborder Epiprocta or, in the strict sense, the infraorder Anisoptera (from Greek ανισος anisos, "uneven" + πτερος pteros, "wings", due the hindwing being broader than the forewing). It is characterized by large multifaceted eyes, two pairs of strong transparent wings, and an elongated body. Dragonflies are similar to damselflies, but the adults can be differentiated by the fact that the wings of most dragonflies are held away from, and perpendicular to, the body when at rest. Dragonflies possess six legs (like any other insect), but most of them cannot walk well. Dragonflies are some of the fastest insects in the world.

Dragonflies are valuable predators that eat mosquitoes, and other small insects like flies, bees, ants, wasps, and very rarely butterflies. They are usually found around marshes, lakes, ponds, streams, and wetlands because their larvae, known as "nymphs", are aquatic.

The Keeled Skimmer, Orthetrum coerulescens, is a species of European dragonfly. This species resembles the Black-tailed Skimmer but is slimmer and the male has no black tip. Females and immature males lack the black abdominal pattern. The pterostigma is orange and the thorax usually bears pale stripes. It breeds mainly in peat bogs and flies (in the UK) from June to September including places like Chudleigh Knighton Heath.

This dragonfly is common in central and southern Europe. It is locally common in western Britain and Ireland. Its typical habitat is acidic heath land, where it is often seen alongside Golden-Ringed Dragonflies. Its flight is quite skittish, with frequent hovering, and it lands often. It can fly quite a distance from water, despite its seemingly weak flight. When it perches, the wings are held forward.