Damselflies and dragonflies are among the most beautiful and spectacular . They are also among the most ancient of creatures and, millions of years ago, included some of the largest flying invertebrates ever. Odonates are in both nymph and adult forms, with a large appetite for smaller insects. Their lives are closely tied to fresh water as the nymphs are at least semi-aquatic. Dragonflies can be distinguished from damselflies by larger eyes, that usually touch, different shaped fore- and hindwings which they hold horizontally when at rest and by their more powerful . Damselflies have similar shaped wings which they hold close to the body when resting.
Source: http://www.bbc.co.uk/nature/life/Odonata
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