Paul Hobson / Pearl-bordered fritillary (Boloria euphrosyne) butterfly basking on Bracken (Pteridium aquilinum) frond. North Wales, UK. June.

Paul Hobson / Pearl-bordered fritillary (Boloria euphrosyne) resting on Bracken (Pteridium aquilinum) frond. North Wales, UK. June.

Jussi Murtosaari / Pearl-bordered fritillary (Boloria euphrosyne) feeding from Wild Rosemary (Rhododendron tomentosum), Finland, June.

Andy Sands / Pearl-bordered fritillary (Boloria euphrosyne) roosting on Bracken frond, Hampshire, England, UK, May

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) Roosting on Bluebell flower, Hampshire, England, UK, May

Jussi Murtosaari / Pearl Bordered Fritillary butterfly (Clossiana euphrosyne) male, central Finland, May.

Jussi Murtosaari / Pearl Bordered Fritillary (Clossiana euphrosyne) eating on a flower, central Finland, June.

Jussi Murtosaari / Pearl-bordered Fritillary butterfly (Boloria euphrosyne) female sunbathing in habitat, central Finland, June.

Jussi Murtosaari / Pearl-bordered fritillary (Boloria euphrosyne) butterfly, pair, in flight and nectaring. Jyvaskyla, Central Finland. June.

David Woodfall / Pearl bordered fritillary butterfly (Boloria euphrosyne) on Wild garlic flower, Denbighshire, Wales, UK. May.

David Woodfall / Pearl bordered fritillary butterflies (Boloria euphrosyne) pair mating on Bracken. Denbighshire, Wales, UK. May.

David Woodfall / Pearl bordered fritillary (Boloria euphrosyne) pair on Hawkbit. Denbighshire, Wales, UK. May.