Pal Hermansen / Common brimstone (Gonepteryx rhamni) flying in summer meadow amongst Knapweed (Centaurea sp). Hvaler, Ostfold, Norway. July.

Stephen Dalton / Brimstone butterfly (Gonepteryx sp) in flight over Buddleia flowers, England, UK

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) Male at rest on Primrose flower, West Sussex, UK April

Colin Varndell / Brimstone butterfly {Goneopteryx rhamni} resting on thistle. UK.

Adrian Davies / Male Brimstone butterfly {Gonepteryx rhamni) on March thistle UK, Europe

David Kjaer / Brimstone butterfly on Pussy willow catkins, UK

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) butterfly, newly emerged male nectaring on Thistle. Pargas, Aboland, Finland. July.

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) butterfly, male sheltering under leaf before rain. Jyvaskyla, Central Finland. August.

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) butterfly, male in flight at woodland edge. Jyvaskyla, Central Finland. August.

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) caterpillar, two feeding on Alder buckthorn (Frangula alnus) sapling. Joutsa, Central Finland. June.

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) butterfly pair flying at woodland edge. Jyvaskyla, Central Finland. April.

Jussi Murtosaari / Brimstone (Gonepteryx rhamni) butterfly flying in woodland. Jyvaskyla, Central Finland. April.

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) pupa showing wing colour of Male about to emerge, Hertfordshire, England, UK, May. Captive. Focus Stacked

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) pupa showing wing colour of Male about to emerge, Hertfordshire, England, UK, May - Captive - Focus Stacked

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) female drying wings on underside of Pupae casing, Hertfordshire, England, UK, May - Captive

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) pupa, Hertfordshire, England, UK, May - Focus Stacked

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) pupa Hertfordshire, England, UK, May - Focus Stacked

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) male emerging from pupa, Hertfordshire, England, UK, May - Captive

Ross Hoddinott / Brimstone butterfly (Gonepteryx rhamni) resting among foliage, Meeth Quarry, Devon, UK. June.

Nick Upton / Canary Islands Brimstone (Gonepteryx cleobule) species endemic to highland parts of the Canaries, taking off from Red valerian (Centranthus ruber) flowers Chamorga, Anaga Rural Park, Tenerife, August...

Nick Upton / Canary Islands Brimstone (Gonepteryx cleobule) a species endemic to highland parts of the Canaries nectaring on Red valerian (Centranthus ruber) flowers on a garden wall, Chamorga, Anaga Rural Park, T...

Rod Williams / Brimstone butterfly (Gonepteryx rhamni) male feeding on hawkbit, Hutchinson's Bank, New Addington, London, England, UK. June.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, summer, Upper Bavaria, Germany, August.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight, with Purple loosestrife (Lythrum salicaria) Upper Bavaria, Germany. July.

Konrad Wothe / Brimstone butterfly (Gonepteryx rhamni) in flight on Buddleja flower, Upper Bavaria, Germany, July.

Robin Chittenden / Common brimstone butterflies (Gonepteryx rhamni) in flight, Norfolk, England, UK, May.

David Tipling / Common brimstone butterfly (Gonepteryx rhamni) male North Norfolk, England, UK. February

Kerstin Hinze / Painted lady (Vanessa cardui) nectaring, with a Common brimstone (Gonepteryx rhamni) flying past, Bavarian Forest National Park, Germany, June.

Konrad Wothe / Slow motion clip of a male Brimstone butterfly (Gonepteryx rhamni) landing and feeding on Purple betony (Stachys officinalis), Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a male Brimstone butterfly (Gonepteryx rhamni) nectaring on Purple betony (Betonica officinalis) before taking off, Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a male Brimstone (Gonepteryx rhamni) nectaring on Purple betony (Betonica officinalis), before taking off, Bavaria, Germany, July.

Konrad Wothe / Slow motion clip of a male Brimstone (Gonepteryx rhamni) nectaring on Purple betony (Betonica officinalis), before taking off, Bavaria, Germany, July.

Dave Bevan / Common brimstone (Gonepteryx rhamni) nectaring on Common comfrey flowers (Symphytum officinale) before being displaced by a Bumblebee (Bombus), Norfolk, England, UK, June.

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) on Yellow rattle flower (Rhinanthus minor) Somerset, England, UK, May.

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) male in flight, Sussex, England, UK, July.

Rod Williams / Brimstone butterfly (Gonepteryx rhamni) male feeding on Everlasting sweet pea (Lathyrus latifolius) Brockley Cemetery, Lewisham, London, England, UK. July.

Rod Williams / Brimstone (Gonepteryx rhamni) male feeding on Everlasting sweet pea (Lathyrus latifolius) Brockley Cemetery, Lewisham, London, England, UK. July.

Nick Upton / Brimstone butterfly (Gonepteryx rhamni) feeding on a Red campion flower (Silene dioica) in a woodland clearing, Wiltshire, UK, July.

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) male walking from roosting on Cowslip (Primula veris) Bedfordshire, England, UK, April

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) male roosting on Cowslip (Primula veris) Bedfordshire, England, UK, April

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) male roosting on Cowslip (Primula veris) Bedfordshire, England, UK, April

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) female roosting on Greater butterfly orchid (Platanthera chlorantha) Bedfordshire, England, UK, August

Andy Sands / Brimstone butterfly (Goneopteryx rhamni) male on Wild basil flower (Clinopodium vulgare) Hertfordshire, England, UK, August

Lorraine Bennery / Brimstone butterfly (Gonepteryx rhamni), Isere, France, March.

Nick Upton / Brimstone butterfly (Gonepteryx rhamni) nectaring on a Viper's bugloss flower (Echium vulgare), Cares Gorge, Picos de Europa mountains, Spain, August.

Kim Taylor / Brimstone butterfly (Gonepteryx rhamni) eggs on Alder Buckthorn (Frangula alnus) leaf. Surrey, England, UK, May. Digitally enhanced.