Best time to see: Jul to end Jul

Key facts

A rare metallic-green damselfly restricted to fens and coastal marshes

Habitat: pools, marshes and ditches with abundant emergent vegetation

Rare and localised in Britain – only in Essex, Kent and Norfolk; otherwise widespread across northern hemisphere

Recognition

M is metallic green with blue eyes, a blue 'tail' and broad brown claspers; F has squarish spots on abdomen segment 2

Perches with wings half open within dense vegetation

Fly between July and August, feeding on small insects such as flies and midges

Lifecycle

Females lay eggs individually into the tissue of a wide range of aquatic plants, guarded by the male

Larvae overwinter in muddy bottoms, usually for two years

Larvae travel long distances to emerge as adults, to shrubs and trees up to 100m away