Sven Zacek / Brimstone butterfly(Gonepteryx rhamni) male and female during mating flight, early spring. Tartumaa county, Southern Estonia. May.

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

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) on Bluebell flower, UK

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

Silvia Reiche / Brimstone (Gonepteryx rhamni) butterfly on Red Campion (Silene dioica), Eifel, Germany

Silvia Reiche / Brimstone (Gonepteryx rhamni) drying its wings after emerging from chrysalis, Eifel, Germany. Sequence 17 of 17

Silvia Reiche / Brimstone (Gonepteryx rhamni) drying its wings after emerging from chrysalis, Eifel, Germany. Sequence 15 of 17

Silvia Reiche / Brimstone (Gonepteryx rhamni) drying its wings after emerging from chrysalis, Eifel, Germany. Sequence 14 of 17

Silvia Reiche / Brimstone (Gonepteryx rhamni) emerging from chrysalis, Eifel, Germany. Sequence 10 of 17

Silvia Reiche / Brimstone (Gonepteryx rhamni) butterfly chrysalis, Eifel, Germany. Sequence 1 of 17

Silvia Reiche / Brimstone (Gonepteryx rhamni) butterfly, Eifel, Germany

Silvia Reiche / Brimstone (Gonepteryx rhamni) butterlfy egg on leaf, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Brimstone (Gonepteryx rhamni) egg on leaf, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Brimstone (Gonepteryx rhamni) caterpillar beginning to build chrysalis, Hoogeloon, Noord-Brabant, Netherlands

Silvia Reiche / Brimstone (Gonepteryx rhamni) chrysalis, Hoogeloon, Noord-Brabant, Netherlands

Jussi Murtosaari / Male Commopn brimstone butterfly (Gonepteryx rhamni) nectaring on February Daphne (Daphne mezereum), Finland. April.

Jussi Murtosaari / Hybrid Pasque flower (Pulsatilla patens x vernalis) in pine forest with resting Common brimstone butterfly (Gonepteryx rhamni), Finland. May.

Jussi Murtosaari / Hybrid Pasqueflower (Pulsatilla patens x vernalis), flowering in pine forest, with resting Brimstone butterfly (Gonepteryx rhamni), Finland. May.

Adrian Davies / Brimstone butterfly (Gonepteryx rhamni) female resting on leaf, Surrey, UK. July.

Stephen Dalton / Brimstone butter (Gonepteryx rhamni) male in flight with Buddleia. England, UK.

Nick Upton / Brimstone butterfly (Gonepteryx rhamni) nectaring on a Creeping thistle (Cirsium arvense) flowerhead on a chalk grassland down, near Calne, Wiltshire, UK, July.

Stephen Dalton / Brimstone butterfly (Gonepteryx rhamni) male in flight, approaching flower head.

Jussi Murtosaari / Brimstone butterfly (Gonepteryx rhamni) male nectaring on Coltsfoot (Tussilago farfara). Jyvaskyla, Finland. May.

Jussi Murtosaari / Brimstone butterfly (Gonepteryx rhamni) male nectaring on Goat willow (Salix caprea) catkins. Jyvaskyla, Finland. May.

Jussi Murtosaari / Brimstone butterfly (Gonepteryx rhamni) male nectaring on Mezereon (Daphne mezereum). Jyvaskyla, Finland. April.

Mike Read / Brimstone butterfly (Gonepteryx rhamni) male feeding on Lesser burdock (Arctium minus) Westhay Moor Nature Reserve, Somerset Wildlife Trust Reserve, Avalon Marshes, Somerset Levels and Moors, Somerset...

Fabrice Cahez / Common brimstone butterfly (Gonopteryx rhamni) on Teasel flower (Dipsacus fullonum) France, July.

Pal Hermansen / RF - Common brimstone (Gonepteryx rhamni) flying towards flowers. Akershus Norway. July. (This image may be licensed either as rights managed or royalty free.)

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.

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.