Ross Hoddinott / Marsh fritillaries (Euphydryas aurinia) resting on spotted heath orchid (Dactylorhiza maculata), Dunsdon, near Holsworthy, Devon, UK. June 2016.

Lorraine Bennery / Knapweed fritillary butterflies (Melitaea phoebe) on Green winged orchid (Anacamptis morio), Grands Causses Regional Natural Park, France, May.

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

Ross Hoddinott / Silver-washed fritillaries (Argynnis paphia) feeding on knapweed, Meeth Quarry, Devon, UK. July.

Ross Hoddinott / Silver-washed fritillaries (Argynnis paphia) feeding on bramble, Meeth Quarry, Devon, UK. July.

Konrad Wothe / Slow motion clip of Ringlets (Aphantopus hyperantus) nectaring on a Knapweed (Centaurea) flower alongside False heath fritillaries (Melitaea diamina), with a Marbled white (Melanargia galathea) flying...

Ernie Janes / Silver-washed fritillaries (Argynnis paphia) basking on leaf, Holt Country Park, Norfolk, England, UK, July.

Ann & Steve Toon / Snakeshead fritillaries (Fritillaria meleagris) in Iffley Meadow, Oxford. April.

Lorraine Bennery / Lesser marbled fritillary butterfly (Brenthis ino), Haute-Savoie, France, June.

Jussi Murtosaari / Silver washed fritillary butterfly (Argynnis paphia) female in flight with thistles, Uusimaa, Finland, August.

Nick Upton / White and purple Snake's head fritillaries (Fritillaria meleagris) and Dandelions (Taraxacum officinale) flowering in grass meadow, Clattinger Farm, Oaksey, Wiltshire, UK, April.

Nick Upton / Lowland hay meadow with flowering Snake's head fritillaries (Fritillaria meleagris), Clattinger Farm, Oaksey, Wiltshire, UK, April.