Peacock Butterfly

The Peacock Butterfly is a familiar and much-loved species of the brush-footed butterfly family Nymphalidae, common across Europe and temperate parts of Asia. Its striking wing pattern — four large, eye-like markings set against a warm reddish-brown background — makes it one of the most instantly recognizable butterflies in its range.

It belongs to the same genus as the Small Tortoiseshell, both being close relatives that feed as caterpillars on stinging nettles and hibernate as adults through winter. This overwintering strategy allows Peacock Butterflies to be among the very first butterflies seen on warm days in early spring, well before many other species have emerged.

The large eyespots are believed to function as a defensive display, startling or misdirecting potential predators when the butterfly suddenly flashes open its wings from a resting position.

• Rich reddish-brown to maroon wings with four large, dark eyespots — one on each forewing and one on each hindwing — each ringed with blue, yellow, and black.
• Wing margins are scalloped rather than smooth, giving a slightly ragged outline.
• Underside of the wings is dark, almost black, providing camouflage as dead leaves when the wings are closed at rest.
• Medium-large size for a European butterfly, with a wingspan typically around 2.5 inches.
• Distinguished from the Small Tortoiseshell by its large true eyespots, versus the tortoiseshell's smaller blue marginal spots and more orange overall tone.

Widespread across Europe and into temperate Asia, found in gardens, parks, woodland clearings, hedgerows, and meadows wherever nettles and nectar sources are available. Adults overwinter in sheltered spots such as tree hollows, sheds, or dense vegetation, emerging on mild days as early as late winter and remaining active through much of spring, summer, and autumn.

Adults are strong fliers and enthusiastic visitors to garden flowers, particularly buddleia, thistles, and other nectar-rich blooms, especially before going into winter dormancy. When threatened, a resting Peacock Butterfly can suddenly flick open its wings to display the four large eyespots, sometimes accompanied by a hissing sound produced by rubbing wing veins together, both believed to startle potential predators. Caterpillars feed gregariously in large groups on stinging nettles, spinning communal silk webbing over the foliage.

Eggs are laid in large batches on the undersides of nettle leaves. Caterpillars are black, speckled with white dots and covered in branching spines, and feed communally through most of their development before dispersing to pupate individually. There are typically one to two generations per year depending on climate, and adults of the final generation enter hibernation to overwinter as adult butterflies, re-emerging in spring to breed.