The Black-tailed Skimmer (Orthetrum cancellatum), is a European dragonfly.
Black-tailed Skimmer - http://www.flickr.com/photos/gordiesbirdies
The male has a blue abdomen with a black tip and transparent wings, and the female has a yellowish brown body with black zigzag marks along the abdomen and the transparent wings. This species has expanded its range, assisted by the creation of gravel pits which give it the extensive open unvegetated areas it prefers. It was first recorded in Great Britain in Essex in 1934.
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When the Black-tailed Skimmer is active
Male Black-tailed Skimmer - Oliver Creamer