Sven Zacek / Fritillary butterfly (Melitaea sp.) – either Heath or False Heath – at rest on a grass stem. Estonia, Europe, June.

David Kjaer / Pearl-bordered Fritillary butterfly (Boloria euphrosyne) at rest on Bracken with wings open, Bentley Wood, Wiltshire, England, UK

David Kjaer / Pearl-bordered Fritillary butterfly (Boloria euphrosyne) at rest on Bracken with wings closed, Bentley Wood, Wiltshire, England, UK

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.

Danny Green / Pearl-bordered fritillary (Boloria selene) sunning on a fern frond, Glenn Afric, Scotland, July. Bookplate from Danny Green's 'The Long Journey North'