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

Wild Wonders of Europe / Benvie / Mountain arnica (Arnica montana) with Fritillary butterfly (Boloria sp) on flower, Naturpark Kaunergrat, Tirol, Austria, July 2008

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) on bugle flower. West Sussex, England, June.

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) with wings closed on Yellow Archangel (lamiastrum galeoblodon) flower. West Sussex, England, June.

Andy Sands / Pearl-bordered Fritillary (Boloria euphrosyne) with wings closed on Bugle flower. West Sussex, England, June.

David Kjaer / Small Pearl-bordered Fritillary butterfly (Boloria selene) at rest on grass stem, Worcestershire, England, UK.

David Kjaer / Small Pearl-bordered Fritillary butterfly (Boloria selene) at rest on grass stem, Worcestershire, England, UK.

David Kjaer / Small Pearl-bordered Fritillary butterfly (Boloria selene) at rest on dead Bracken frond, in woodlands, Wiltshire, England, UK.

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

David Kjaer / Pearl-bordered Fritillary butterfly (Boloria euphrosyne) at rest on leaf litter, on woodland floor, Bentley Wood, Wiltshire, England, UK.

Stephen Dalton / Small pearl bordered fritillary butterfly (Boloria selene) on Bugle flower (Ajuga sp) UK

Stephen Dalton / Pearl bordered fritillary butterfly (Brenthis / Boloria euphrosyne) on Bugle flowers (Ajuga sp) UK

Wild Wonders of Europe / Benvie / Fritillary (Boloria sp) Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Silvia Reiche / Shepherd's Fritillary (Boloria pales) butterfly, Hohe Tauern National Park, Austria

Silvia Reiche / Cranberry Fritillary (Boloria aquilonaris) butterfly on Cross-leaved Heath (Erica tetralix) flowers, Drenthe, Netherlands

Silvia Reiche / Cranberry Fritillary (Boloria aquilonaris) butterfly, Drenthe, Netherlands

Silvia Reiche / Cranberry Fritillary (Boloria aquilonaris) butterfly on Cross-leaved Heath (Erica tetralix), Drenthe, Netherlands

Silvia Reiche / Cranberry Fritillary (Boloria aquilonaris) butterfly on Cross-leaved Heath (Erica tetralix), Drenthe, Netherlands

Thomas Marent / Shepherd's Fritillary (Boloria pales) butterfly, Switzerland

Silvia Reiche / Ocellate Bog Fritillary (Boloria eunomia) on Common Bistort (Polygonum bistorta) flower, Germany

Silvia Reiche / Ocellate Bog Fritillary (Boloria eunomia) on Common Bistort (Polygonum bistorta) flower, Germany

Silvia Reiche / Ocellate Bog Fritillary (Boloria eunomia) on Common Bistort (Polygonum bistorta) flower, Germany

Silvia Reiche / Ocellate Bog Fritillary (Boloria eunomia) on Common Bistort (Polygonum bistorta) flower, Germany

Thomas Marent / Mountain Fritillary (Boloria napaea) butterfly female, Switzerland

Thomas Marent / Small Pearl-bordered Fritillary (Clossiana selene) butterfly, Switzerland

Thomas Marent / Small Pearl-bordered Fritillary (Clossiana selene) butterfly, Switzerland

Jan Vermeer / Small Pearl-bordered Fritillary (Boloria selene) butterfly feeding on flower, Europe