How do I identify the woodland ringlet?

Look for a medium-sized dark brown butterfly with a row of orange-ringed, white-pupilled black eyespots on both fore- and hindwings. The underside hindwing is greyish-brown with the same eyespot pattern. The eyespots are more numerous and evenly distributed than in similar Erebia species such as the mountain ringlet (E. epiphron). In flight, the species looks uniformly dark — the eyespot pattern only becomes clear when the butterfly settles on vegetation.

Where does the woodland ringlet live?

Despite the English name, the woodland ringlet favours damp grasslands, forest glades, and moist upland meadows rather than dense woodland. It is found from Central Europe (Alps, Carpathians, Sudetes, Harz) through Poland and the Baltic states to southern Scandinavia, the Urals, and across Siberia to the Russian Far East. In the Alps it occurs from valley floors up to about 1,800 m; in Russia it colonises both lowland bogs and mountain slopes.

Why is the woodland ringlet declining in parts of Europe?

The main cause is the loss of damp, traditionally managed grasslands. Agricultural drainage, scrub encroachment following the abandonment of hay-cutting, and conversion of meadows to arable land all destroy the moist, tall-grass sward the species requires. Climate warming is causing the butterfly to shift to higher elevations, which compresses its available habitat. In Central Europe several regional Red Lists now classify it as near threatened or vulnerable.

Butterfly Atlas

Erebia medusa

Woodland Ringlet

~1 min

The woodland ringlet (Erebia medusa) is a satyr butterfly of damp meadows across central Europe, with chocolate-brown wings and orange-ringed eyespots.

Key facts

Latin name: Erebia medusa
Family: Nymphalidae
Wingspan: 34–45 mm
Flight season: May — June
Host plants: Purple moor-grass (Molinia caerulea), Meadow-grass (Poa pratensis), Red fescue (Festuca rubra), Wood small-reed (Calamagrostis epigeios)
Conservation status: LCLeast Concern

Appearance

The woodland ringlet is a medium-sized butterfly with a wingspan of 34–45 mm. Both surfaces of the wings are dark chocolate-brown; the upperwing bears a band of conspicuous orange-ringed, white-pupilled black eyespots that run from the forewing apex to the outer hindwing margin — usually four to six spots on the forewing and four to five on the hindwing.

The underside repeats the eyespot pattern on a slightly paler, greyish-brown ground, providing camouflage when the butterfly rests with wings closed on dead grass. Males are marginally darker than females; worn individuals lose both the orange rings and the white pupils, making late-season identification tricky.

Range and habitat

The woodland ringlet ranges from the Alps and Carpathians east through Central Europe, Poland, and the Baltic states to southern Scandinavia, and continues across the Urals and West Siberia to the Altai and Sayan mountains. Isolated populations exist in the Harz and Thuringian Forest in Germany.

Preferred habitats are damp, tall-grass meadows, forest clearings, and the margins of wet woodland rides. Unlike some Erebia species that are strictly montane, E. medusa occurs from near sea level in Poland and Russia to about 1,800 m in the Alps, wherever stands of purple moor-grass (Molinia caerulea) and other tall grasses thrive in moist, moderately shaded conditions.

Life cycle

The woodland ringlet is single-brooded, with adults flying from mid-May to the end of June depending on altitude and latitude. In Alpine populations the flight period begins in late June and ends in July.

Females lay eggs singly on grass blades. The young caterpillar hatches in summer but grows slowly through autumn; it overwinters as a small larva, often among the basal leaf sheaths of the host plant, and completes its development the following spring. The pupa is formed at the base of a grass stem or in the soil litter. The larval stage lasts around ten months in total — far longer than most temperate butterflies.

Behaviour

Adults are most active during sunny spells; they close their wings and become almost invisible in dull weather. Males perch on grass stems or patrol short circuits over meadow vegetation, waiting for females. Both sexes feed on low-growing flowers — knapweed, clover, and ragged-robin are favourites.

The species is relatively sedentary: most individuals remain within a few hundred metres of their emergence site. This makes locally isolated populations very vulnerable to habitat loss.

Conservation

The woodland ringlet is listed Least Concern (LC) globally, but regional trends are negative in parts of Western and Central Europe. Traditional hay-meadow management, with late summer mowing, benefits populations by maintaining the open, grassy structure and preventing scrub encroachment. Where drainage schemes have lowered water tables or where meadows have been converted to arable fields, the species disappears rapidly and rarely recolonises once lost.