AT A GLANCE
- Common Name: Small Copper
- Scientific Name: Lycaena phlaeas
- Category: Invertebrates
- Subcategory: Insects
- Range: Circumpolar across the Holarctic, including Europe, North Africa, temperate Asia, and North America; isolated high-altitude populations in East Africa
- Habitat Type: Dry grasslands, heathlands, coastal dunes, railway embankments, road verges, and open wasteland where sorrel plants grow
- IUCN Red List Status: Least Concern
- Lifespan: 10 to 14 days as an adult; produces 2 to 3 generations per year
- Diet: Herbivorous (adults feed on nectar from ragwort, dandelions, fleabane, and thistles; larvae feed on common sorrel and sheep’s sorrel)
- Average Size/Weight: 26 to 32 mm wingspan; weight less than 0.25 g
- Key Defining Feature: Dazzling, burnished copper-orange forewings studded with bold black square spots and bordered by dark margins, contrasting with slate-brown hindwings
Overview
The Small Copper (Lycaena phlaeas), also known across North America as the American Copper, is a glittering, fiery-hued jewel of the open countryside. Distributed across the vast temperate landscapes of the Northern Hemisphere, this pugnacious little butterfly belongs to the gossamer-winged family Lycaenidae. Instantly recognized by its radiant, metallic copper-orange wings that seem to glow like polished metal in direct sunlight, it is famous for its fierce, territorial pugnacity. Despite its tiny size, a male Small Copper will fearlessly dive-bomb passing dogs, birds, and butterflies that trespass across its sunlit patch of meadow.
Biology and Physical Characteristics
Lycaena phlaeas is a compact, robustly built butterfly with a rapid, darting flight. The upperside of the forewings is a brilliant, iridescent fiery copper-orange, sharply bordered by a broad dark brown or black margin and patterned with nine distinct black square spots. The hindwings are dark sooty-brown, decorated along the outer edge with a striking, scalloped bright copper submarginal band. The underside of the wings is subtly camouflaged: the forewing retains a pale orange hue with black spots, while the hindwing is a muted grey-brown with tiny black dots. The caterpillar is slug-like, bright green with velvety hairs and optional reddish-purple stripes, perfectly camouflaged on the stems of dock and sorrel plants.
Behavior and Ecology
Small Coppers are among the most fiercely territorial insects in the meadow. Males select open patches of bare earth or prominent stones within dry grasslands, perching with wings partially opened to thermoregulate. From these vantage points, they launch ferocious interception flights against any flying insect—including much larger vanessid butterflies like peacocks and red admirals—chasing intruders relentlessly until they vacate the territory. Females deposit tiny, golf-ball-like white eggs singly on the leaves of common sorrel (Rumex acetosa) and sheep’s sorrel (Rumex acetosella). The species is multivoltine, producing two to three overlapping generations between April and October in temperate latitudes.
Conservation and Human Impact
The Small Copper is assessed as Least Concern on the IUCN Red List, supported by its enormous global range and strong adaptability to early-successional habitats and brownfield sites. While globally secure, local populations in agricultural regions fluctuate heavily due to herbicide spraying that eliminates sorrel host plants, and drought conditions that cause host plants to desiccate before caterpillars complete development. Establishing wildflower strips, preserving uncultivated field margins, and maintaining open ground in nature reserves helps sustain stable breeding colonies.
Interesting Factoid
The male Small Copper is famously pugnacious: it defends a small patch of sunlit meadow with such fierce territorial aggression that it will regularly launch into the air to attack butterflies ten times its size, dragonflies, and even human shoes walking past.