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Dragonflies detachment good flying predatory insects. Relatively large with a moving head large eyes short antennae bristle four transparent wings with a dense network of veins and elongated slender belly. The number of described species of dragonflies as of August 2013 including 608 fossil species. Most modern species live in the tropics and subtropics moist. In Russia dragonflies are widely distributed throughout the country the fauna includes about 150 species. On the territory of the former USSR 172 species were recorded and 69 sub-species of dragonflies are grouped into 52 kinds 10 families and 3 suborder.

The largest is a Megaloprepus caerulatus inhabiting the Central and South America with a body length of up to 120 mm and with a wingspan of up to 190 mm. One of the smallest is a view Agriocnemis femina wingspan 20 mm. When you are flying wave front and rear pairs of wings alternately achieving better maneuverability or simultaneously greater speed. At damselflies front and rear wings narrow almost the same shape in rest raised up and pressed against each other. At dragonfly wings different in form alone flattened in side rear pair with extended bases. Wing length 40-94 mm and 70-120 mm abdomen. Maximum flight speed may reach 50 km/h. Wings at the front near the top well noticeable thickening dark pterostigma quenching dangerous vibrations oscillations of the wings during flight which may damage the wings turn when exceeding a certain speed.

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