Sirhowy Hill Woodlands

Scientific name: Euthrix potatoria


July to August. Common and well distributed to England, becoming more coastal to the north and in Scotland. Their name is derived from the habit of the caterpillars which are said to like drops of dew.


Distinguished from other large eggar moths by the diagonal cross line on the forewing and two small white spots. Males are usually a warm reddish-brown with yellowish patches. The females are larger and can vary in colour from deep yellow to a very pale buff, whitish or a darker reddish-brown similar to the male. In the fens of East Anglia the males are often yellowish.


The adults fly at night and are attracted to light, the males especially.

What does the Drinker eat?

The Drinker eats a wide range of coarse grasses and reeds including Cock’s-foot (Dactylis glomeratus), couches, Common Reed (Phragmites australis), Reed Canary-grass (Phalaris arundinacea) and Wood Small-reed (Calamagrostis epigejos).

What habitat does the Drinker live in?

The Drinker are most frequent in tall, damp grassland, fens, marshes, damp open woodland, scrub and ditches.

What family does the Drinker belong to?

The Drinker belong to the Lasiocampidae family.

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Scientific Name

Euthrix potatoria


England, Wales, Scotland and Ireland


Large sized

Wingspan Range: 42-70mm


Well distributed throughout England and Ireland

Other Wildlife