Jussi Murtosaari / Pallas Fritillary (Argynnis laodice) portrait of female head on, southern Finland, August.

Wild Wonders of Europe / Benvie / Spotted fritillary (Melitaea didyma) on Plantain seed head, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Wild Wonders of Europe / Benvie / Spotted fritillary (Melitaea didyma) on Plantain seed head, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008 WWE OUTDOOR EXHIBITION

Peter Lewis / Snakes head fritillary (Fritillaria meleagris) flowering with Dandelions in meadow Cricklade, Wiltshire, England, UK, April.

Nigel Cattlin / Crown imperial (Fritillaria imperialis) flower head, close up.

Heather Angel / Snake's head fritillary (Fritillaria meleagris), view into flower with linear green nectaries. In cultivation, Surrey, England, UK. April.

Heather Angel / Wasp (Dolichovespula sp) emerging from nectaring on Michailovski fritillary (Fritillaria michailovskyi) flower. To reach the nectaries it squeezes past anthers picking up large pollen load on head and...

Mike Read / Snakeshead fritillary (Fritillaria meleagris) growing in garden lawn. Corfe Mullen, Dorset, England, UK. April.

Adrian Davies / Snakeshead fritillary (Fritillaria meleagris), rare double white variety. Beech Hill, Berkshire, England, UK. April.

Chris Mattison / Snakeshead Fritillary (Fritillaria meleagris) Monmouthshire, Wales, UK. March.

Ann & Steve Toon / Wildlife Trust volunteers surveying Snakeshead fritillary (Fritillaria meleagris) flowers. Iffley Meadow, Oxford. April.

Ann & Steve Toon / Snakeshead fritillary (Fritillaria meleagris) flower, Iffley Meadow, Oxford, April