Ross Hoddinott / Common blue butterflies (Polyommatus icarus) basking in the morning light, Vealand Farm, Devon, UK. July

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on devil's bit scabious (Succisa pratensis), Vealand Farm, Devon, UK. August

Ross Hoddinott / Common blue butterflies (Polyommatus icarus) resting on grasses, Vealand Farm, Devon, UK. June 2017

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on grasses at sunset, Vealand Farm, Devon, UK. July.

Benjamin Barthelemy / Brown argus (Aricia agestis) butterfly, Vallee de la Seille (Seille Valley), Lorraine, France, August.

Ross Hoddinott / 2020VISION / Common blue butterfly (Polyommatus icarus), resting on flowering heather, Arne RSPB reserve, Dorset, England, UK September

Florian Möllers / Common blue butterfly (Polyommatus icarus)warming up, Berlin, Germany, July

Colin Varndell / Common blue butterfly (Polyommatus icarus) at rest. Dorset, UK, May

Wild Wonders of Europe / Maitland / Nipplewort (Lapsana communis) in flower with Escher’s blue butterfly (Polyommatus escheri) and Silver-studded blue (Plebejus argus) Stenje region, Galicica National Park, Macedonia, June 2009, dead in...

Wild Wonders of Europe / Maitland / Female Common blue butterfly (Polyommatus icarus) on Trefoil (Lotus sp) Lake Macro Prespa, Stenje region, Galicica National Park, Macedonia, June 2009

Guy Edwardes / Common blue butterfly (Polyommatus icarus) resting on grass, Dorset, England, May

Kim Taylor / Common blue butterfly (Polyommatus icarus) females awaking at sunrise among Harebells (Campanula rotundifolia) Surrey, England, digital composite

Andy Sands / Common Blue (Polyommatus icarus) Male at rest wings closed, on flower, Captive

Ross Hoddinott / Common blue butterfly {Polyommatus icarus) Cornwall, UK. June

Ross Hoddinott / Common blue butterfly {Polyommatus icarus} resting on Bee orchid {Ophrys apifera}, Bude, Cornwall.

Jose B. Ruiz / Common blue butterfly {Polyommatus icarus} Spain

Ross Hoddinott / Common blue butterfly {Polyommatus icarus} Cornwall UK

Ross Hoddinott / Common blue butterfly {Polyommatus icarus} resting on bee orchid {Ophrys apifera}, Cornwall. UK

Ross Hoddinott / Common blue butterfly {Polyommatus icarus} Dunsdon Nature Reserve (DWT), near Holsworthy, Devon. UK

Ross Hoddinott / Common blue butterfly {Polyommatus icarus} resting on plantain, Dorset. UK

Geoff Scott-Simpson / Common blue butterfly {Polyommatus icarus} on Common spotted orchid {Dactylorhiza fuchsii} UK peakdale peak district NP

Erlend Haarberg / Common blue (Polyommatus icarus) male, Innlandet, Norway, July.

Bernard Castelein / Common blue (Polyommatus icarus) butterfly resting on flowerhead. Klein Schietveld, Brasschaat, Belgium. August.

Bernard Castelein / Common blue (Polyommatus icarus) butterfly on flowerhead. Klein Schietveld, Brasschaat, Belgium. August.

Rod Williams / Mating pair of common blue butterflies (Polyommatus icarus) on dried thistle head, Sutcliffe Park Nature Reserve, Eltham, London, England, August

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) basking in the evening light, Vealand Farm, Devon, UK. June

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on heather, Westhay Moor, Somerset, UK. July

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on willowherb, Vealand Farm, Devon, UK. July

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on grasses, Vealand Farm, Devon, UK. August 2017

Ross Hoddinott / Common blue butterflies (Polyommatus icarus) basking in the morning light, Vealand Farm, Devon, UK. July

Rod Williams / Common blue butterfly (Polyommatus icarus) male on common vetch Sutcliffe Park Nature Reserve, Eltham, London, England, UK. May.

Paul Hobson / Common blue butterfly (Polyommatus icarus) pair mating, perched on Bracken (Pteridium aquilinum) frond. North Wales, England, UK. June.

Andy Sands / Common Blue Butterfly (Polyommatus icarus) feeding on Burnt-tip Orchid (Orchis ustulata) , East Sussex, England, UK, May

Andy Sands / Common Blue Butterfly (Polyommatus icarus) feeding on Burnt-tip Orchid (Orchis ustulata) , East Sussex, England, UK, May

Andy Sands / Common Blue Butterfly (Polyommatus icarus) roosting communally, East Sussex, England, UK, May

Rod Williams / Common blue butterflies (Polyommatus icarus) mating pair on Clover (Trifolium) Sutcliffe Park Nature Reserve, Eltham, London, England, UK. May.

Rod Williams / Common Blues (Polyommatus icarus) mating pair on Clover (Trifolium) Sutcliffe Park Nature Reserve, Eltham, London, England, UK. May.

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on grasses, Vealand Farm, Devon, UK. August

Ross Hoddinott / Common blue butterfly (Polyommatus icarus) resting on grass on a dewy morning, Vealand Farm, Devon, UK. July.

Ross Hoddinott / Common blue butterflies (Polyommatus icarus) resting on grasses, Vealand Farm, Devon, UK. June

Ross Hoddinott / RF - Common blue butterflies (Polyommatus icarus) resting on a backlit grass, evening light, Vealand Farm, Devon, UK. June. (This image may be licensed either as rights managed or royalty free.)

Rod Williams / Common blue butterfly (Polyommatus icarus) female, Sutcliffe Park Nature Reserve, Eltham, London, England, UK. August.

Rod Williams / Common blue butterfly (Polyommatus icarus) on tufted vetch, Sutcliffe Park Nature Reserve, Eltham, London, England, UK, July.

Loic Poidevin / Two Common blue butterflies (Polyommatus icarus) mating on Common fleabane flowers (Pulicaria dysenterica), Vendee, France. July.

Lorraine Bennery / Common blue butterfly (Polyommatus icarus), Isere, France, May.

Lorraine Bennery / Common blue butterfly (Polyommatus icarus) and Glanville fritillary butterfly (Melitaea cinxia), Var, France, May.

Lorraine Bennery / Common blue butterfly (Polyommatus icarus) on the Bee orchid (Ophrys demangei) Drome, France, May.

Lorraine Bennery / Common blue butterfly (Polyommatus icarus) on the Bee orchid (Ophrys demangei) Drome, France, May.