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This is a robust medium sized dragonfly (Anisoptera), where immature males are yellow and black. When mature the yellow areas turn to the palest of greens tending to yellow except on the flanks of abdominal segment 8 & 9 which remain bright yellow.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 51.5, -1.2
OS grid ref: SU6080