Demoiselles are difficult to photograph. They are extremely shy and have excellent eyesight.
Their huge, protruding eyes have as many as 28,000 individual facets. Each of these tiny facets faces a different direction and each produces an image. The insect brain puts all of the images together to form a picture. With these powerful compound eyes, they are able to spot their prey, such a mosquito or gnat, from as far away as 30 meter!
As soon as one comes nearer than 2 meters they usually fly off. For a photograph like this one needs a fair bit of luck, a lot of patience and a moment of dead calm.