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Each has two short basal joints, two long joints, and a three-jointed foot, armed with a pair of claws.

Some species have dark patches on the wings which can provide shade for the body, and a few use the to avoid overheating.

Colouration [ ] in a dragonfly's eyes Many adult dragonflies have brilliant or metallic colours produced by , making them conspicuous in flight.

En el pasado existieron especies mucho mayores.

Dragonflies having simple flaps shed the eggs in water, mostly in flight.

These can have a local impact on dragonfly populations; methods of reducing the attractiveness of structures such as solar panels are under experimentation.

The male holds the female behind the head using a pair of claspers on the terminal segment.

Taku, Kadoya; Shin-ichi, Suda; Izumi, Washitani 2009.

Most species need moderate conditions, not too , not too acidic; a few species such as black darter and four-spotted chaser prefer acidic waters such as peat bogs, while others such as scarce chaser need slow-moving, eutrophic waters with reeds or similar waterside plants.

The male-bias ratio has contributed partially to the females using different habitats to avoid male harassment.

Large, Elizabeth June 27, 1999.