Speckled Wood (Pararge aegeria) in Ireland

Breacfhéileacán coille in Gaeilge. The Speckled Wood, Pararge aegeria, is the woodland-ride brown most Irish walkers see in dappled shade from spring through October.

Identify it in four steps

1. Upperside dark chocolate-brown with pale cream spots on both wings; forewing tip carries a single small black eyespot with a white pupil.
2. Hindwing upperside has three ringed eyespots along the outer margin, smaller than the Meadow Brown’s single spot.
3. Wingspan 46 to 56 mm; flight is a rapid spiral, males often engaging in territorial pursuits along a sun patch.
4. Perches on leaves in the lower canopy with wings held part-open in a shaft of sunlight; a diagnostic behaviour among Irish browns.

Habitat in Ireland

The Speckled Wood is a woodland species that has spread widely into hedgerows, mature gardens, and scrub in the past thirty years. It needs dappled shade rather than full sun and depends on sun patches for thermoregulation and courtship, which is why open rides, wood edges, and gappy hedges suit it.

Larvae feed on shade-tolerant grasses including False Brome (Brachypodium sylvaticum), Cock’s-foot (Dactylis glomerata), and Yorkshire-fog (Holcus lanatus). Both larvae and pupae can overwinter, which is why the species produces multiple overlapping broods and is on the wing across a longer span than most Irish butterflies.

Where to see it

• Glendalough, County Wicklow: oak-woodland rides in the Vale support the species from April onward.
• Killarney National Park, oakwoods at Muckross: sun-flecked ride edges and old woodland tracks.
• Belvedere House parkland, County Westmeath: mature parkland trees and hedgerow gaps give it ideal structure.

Related species

• Meadow Brown (Maniola jurtina)
• Ringlet (Aphantopus hyperantus)
• Wall Brown (Lasiommata megera)