Comma Butterfly (Polygonia c-album)

Comma Butterfly (Polygonia c-album): Identification, Habitat, Life Cycle and Conservation in the UK

The comma butterfly is one of the UK’s most distinctive and resilient butterflies.

Known for its ragged wing edges and the small white “comma” marking on the underside, this species has become a success story in British wildlife—expanding its range and adapting well to a warming climate.

This in-depth guide covers everything you need to know about the comma butterfly, including identification, habitat, behaviour, life cycle, and how to attract it to your garden.

Key Facts at a Glance

Scientific name: Polygonia c-album

Wingspan: 45–50 mm

Habitat: Woodland edges, gardens, hedgerows

Flight period: March to October

Diet: Nectar, sap, fruit, dung

Status: Increasing and expanding in the UK

What is a Comma Butterfly?

The comma butterfly is a medium-sized species belonging to the Nymphalidae family.

It gets its name from a small, white, comma-shaped marking on the underside of its hindwings—an important feature for identification.

Once restricted mainly to southern England, the species has expanded significantly in recent decades and is now widespread across much of the UK.

How to Identify a Comma Butterfly

Key features:

• Deep orange wings with black spots

• Strongly scalloped, ragged wing edges

• Dark brown underside resembling a dead leaf

• Distinct white comma marking on the underside

Wingspan:

• Typically 45–50 mm

Behaviour:

Comma butterflies are often seen basking with wings open in sunny spots, then snapping them shut to reveal their camouflaged underside when disturbed.

This combination of bright upper wings and cryptic underwings makes them both striking and difficult to spot.

Habitat and Distribution in the UK

Comma butterflies are highly adaptable and can be found in a variety of habitats, including:

• Woodland edges and clearings

• Hedgerows and scrubland

• Gardens and parks

• Railway embankments and brownfield sites

Their expansion northwards has been linked to climate warming, allowing them to thrive in areas that were previously too cold.

Today, they are common in England and Wales and increasingly present in parts of Scotland and Northern Ireland.

Life Cycle of the Comma Butterfly

The comma butterfly has a fascinating and flexible life cycle, often producing two broods per year in warmer regions.

1. Egg

Females lay eggs singly on the leaves of host plants.

2. Caterpillar (Larva)

The caterpillars are spiky and bird-dropping-like in appearance, helping deter predators. They feed on plants such as:

• Common nettle

• Elm

• Hops

3. Chrysalis (Pupa)

The chrysalis hangs suspended and resembles a dead leaf, providing excellent camouflage.

4. Adult

Adults emerge in summer or late summer. Some will enter hibernation and reappear the following spring.

Behaviour and Feeding

Unlike many butterflies that rely heavily on nectar, comma butterflies often feed on:

• Tree sap

• Rotting fruit

• Animal dung

This gives them an advantage in early spring and late autumn when flowers are scarce.

They are also territorial and can often be seen chasing away other insects from sunny perches.

Seasonal Activity

Comma butterflies have a long flight period compared to many UK species.

March–May: Overwintered adults emerge

June–July: First new generation appears

August–October: Second generation, some of which hibernate

Their ability to hibernate as adults allows them to take advantage of early spring sunshine.

Why the Comma Butterfly is Thriving

The success of the comma butterfly is closely linked to environmental changes:

Climate change

Warmer temperatures have allowed the species to expand northwards and produce more broods per year.

Adaptable diet

Their willingness to feed on non-nectar sources increases survival rates.

Habitat flexibility

They thrive in both wild and human-modified landscapes.

Threats and Challenges

Despite their success, comma butterflies still face pressures:

• Loss of hedgerows and woodland edges

• Pesticide use reducing food sources

• Extreme weather events, including drought and heavy rain

Sustained environmental change could still impact populations over time.

How to Attract Comma Butterflies to Your Garden

You can support comma butterflies by creating a wildlife-friendly space:

• Plant their food sources

• Nettles (essential for caterpillars)

• Flowering plants for nectar

• Provide alternative food

• Leave out overripe fruit

• Avoid over-tidying

• Create shelter

• Allow hedges and shrubs to grow naturally

• Provide sunny, sheltered spots for basking

Conservation and Monitoring

Organisations such as the Butterfly Conservation monitor comma butterfly populations and trends across the UK.

Citizen science projects and garden sightings have helped track their expansion, making them one of the best-documented butterfly success stories in Britain.

Conclusion

The comma butterfly is a remarkable example of how some species can adapt and even thrive in a changing climate.

Its distinctive appearance, long flight season, and resilience make it a familiar and welcome sight across much of the UK.

Understanding its habits and needs not only helps with identification but also provides valuable insight into broader environmental changes. By making small adjustments in gardens and green spaces, it’s possible to support this species and ensure it remains a success story for years to come.

Photo: Erik Karits

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