Norfolk Hawker (Aeshna isoceles)
(1/1600th sec at f11. Approx 1.25x lifesize. Click image for larger version. © David Hastings)
(1/100th sec at f14. Approx 1.25x lifesize. Click image for larger version. © David Hastings)
(1/200th at f11. Approx 1x lifesize. Click image for larger version. © David Hastings)
Wingspan: 78 - 90mm; Length: 62 - 67mm
A large brown hawker that flies early in the season. The sexes are similar, having brown abdomens with a distinctive yellow triangle on S2, green eyes, clear wings and amber pterostigma.
In Britain this species is largely restricted to the Norfolk Broads. It is fairly widely distributed in western and central Europe, but is generally local.
Typical habitat is grazing marshes and fens with clear water and stable water levels, usually with at least 70% cover of Water-soldier.
Eggs are laid into living Water-soldier plants. They hatch after 3-4 weeks and the larvae develop over two years.
Males patrol low over grazing-marsh ditches, often clashing and chasing each other (and other species).
This a Red data list species and a licence is required to handle it.