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The mayfly’s lifecycle is one of the most fascinating and fleeting stories in the natural world. One of the many characteristics that makes mayflies the unique insects they are is the potential for two different winged adult forms in their life cycle.

The nymph emerges from the water as a dull-coloured sub-imago (or dun) that seeks shelter in bankside vegetation and trees. After a period of a couple of hours or more, the sub-imago once again sheds its skin to transform into the brightly coloured imago (or spinner).

Fly | Winged | Wing | Insect | Skin | Eye