Green Drake

Fascinating facts about the Green Drake

• A male green drake may grow to 15–20 mm, while the female can reach up to 25 mm, and females are the larger sex.
• The whole mayfly life can span up to three years as a nymph, but once it finally emerges the adult stage shrinks to a fleeting four days, showing nature’s extreme contrast between patient growth and brief reproduction.
• Nymphs of Ephemera danica tunnel into river gravels and filter organic detritus, reaching about 30 mm (1.2 in) – a size that lets them hide in the substrate while feeding, a hidden workforce that fuels the river food web.
• Adults take to the air in May–June, but can be seen as late as November; their translucent wings with dark veins and three long tails make them the most common British Ephemeridae, a visual reminder of seasonal change.
• These mayflies live in clear rivers and lakes with sandy or gravel bottoms across Europe, including the British Isles, where they become a snack for swallows, trout, amphibians, and spiders.

At a glance

About the Green Drake

The green drake, Ephemera danica, is a striking mayfly that flits over European rivers and lakes in the warm months. Males emerge with delicate, translucent wings veined in dark lines, measuring 15–20 mm, while females are larger, up to 25 mm, and bear three graceful cerci that sway like tiny ribbons. Their forelegs and tail filaments are disproportionately long compared to the earlier subimago stage, whose wings appear dull yellowish with brown veins. Though they possess mouthparts, these are vestigial; the adult's sole purpose is reproduction, making them true aeroplankton that drift on breezes before vanishing within days. Their brief adult life, no more than four days, ends dramatically as females skim the water’s surface to deposit eggs, then slip beneath and die, leaving their bodies to nourish the very waters that birthed them. Beneath the surface, the nymphs are industrious engineers, carving tunnels into gravel beds and filtering organic detritus for sustenance. Growing up to 30 mm, they may linger for one to three years before the spring emergence that fills the air with swarms of duns and spinners. These mayflies are a vital food source for swallows, trout, amphibians, and spiders, linking the aquatic and aerial food webs in a single, fleeting season of life, a reminder of nature’s relentless cycles that continue even as the green drake’s brief dance draws to a close

Seen on screen

More insects and spiders to discover

Browse Feravox