Emperor dragonfly
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[Photo] Anax imperator (female), laying eggs. Picture taken by Tim Bekaert in De Panne, Belgium (July 3, 2005).

The Emperor Dragonfly, Anax imperator, is a large and powerful species of European hawker dragonfly of the family Aeshnidae, averaging 78 mm in length.

Males have a sky blue abdomen marked with a diagnostic black dorsal stripe and an apple green thorax. Females have a green thorax and abdomen. The male is highly territorial, and difficult to approach. The species lives by larger ponds, gravel pits, and slow rivers.

http://en.wikipedia.org/wiki/Emperor_%28dragonfly%29

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