As the name suggests, the common blue damselfly is one of the commonest species in Ireland. Adult males are predominantly blue, spotted with black markings resembling stripes. Adult females are much darker with larger areas of black and usually a green background colour. Both dragonflies and damselflies are strong and swift fliers. Apart from their smaller size and generally more slender build, the easiest way to distinguish damselflies from dragonflies is the position of the wings when the insect is resting. Dragonflies rest with both pairs of wings held perpendicular to the body, whereas damselflies hold them almost parallel; also damselfly eyes are further apart than those of a dragonfly. Common blue damselflies appear in mid to late May and their flight period lasts right through the summer months to September. Adults live for around 12 days on average and in this short period they must breed. Mating can take up to 20 minutes and the females lay their eggs in the tissue of plants both above and below the water line and are capable of remaining submerged for some time. The male will stay guarding her at the point where she entered the water. The common blue damselfly is found around open lakes and ponds, along river and canal banks, and streams, provided there is plenty of bankside vegetation.
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