Ross Hoddinott / Clouded yellow butterfly (Colias crocea) on Devil's bit scabious (Succisa pratensis), Dunsdon Nature Reserve, Devon, UK. August 2014.

Andy Sands / Clouded yellow butterfly (Colias crocea) feeding on Devil's bit scabious (Succisa pratensis), Hertfordshire, England, UK, September

Andy Sands / Clouded yellow butterfly (Colias crocea) resting on leaf, Hertfordshire, England, UK, September

Colin Varndell / Clouded yellow butterfly (Colias croceus) on Fleabane. Dorset, UK, August.

Nick Upton / Clouded yellow butterfly (Colias croceus) feeding on Headed thyme / Wild thyme flowers (Thymus capitatus), Crete, Greece, May.

Rod Williams / Male Clouded yellow butterfly (Colias croceus) resting on chalky soil, Hutchinson's Bank, New Addington, London, UK, August.

Robert Thompson / Clouded yellow butterfly (Colias croceus / coocea) on flower, Pyrenees National Park, France, June.

Loic Poidevin / Dark Clouded Yellow butterfly (Colias crocea) on alfalfa (Medicago sativa) flower, Vendée, France, July.

Kim Taylor / Clouded Yellow Butterfly (Colias croceus) male feeding on yellow thistle, Croatia, June

Kim Taylor / Clouded Yellow Butterfly (Colias croceus) mating pair. Croatia, June

Benjamin Barthelemy / Common clouded yellow butterfly (Colias Crocea), Reserve Naturelle de la Vallee des Cailles, Eure-et-Loir, France, July.

Benjamin Barthelemy / Common clouded yellow butterfly (Colias Crocea), Reserve Naturelle de la Vallee des Cailles, Eure-et-Loir, France, July.