Alex Hyde / Mountain Clouded Yellow (Colias phicomone) profile portrait, Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy

Robert Thompson / Mountain clouded yellow butterfly (Colias phicomone) Bormio & St Caterina, Alps, Italy, June.

Robert Thompson / Mountain clouded butterfly (Colias phicomone) on clover flower, Stelvo Pass, Alps, Italy, June.

Peter Schwarz/ BIA / Mountain Clouded Yellow (Colias phicomone) female, Valais, Switzerland

Alex Hyde / Mountain Clouded Yellow (Colias phicomone) photographed on a white background, Aosta Valley, Monte Rosa Massif, Pennine Alps, Italy. July.

Alex Hyde / Mountain Clouded Yellow Butterfly (Colias phicomone) on Tuberous Thistle (Cirsium tuberosum), against white background. Nordtirol, Tirol, Austian Alps, Austria, August.

Alex Hyde / Close-up of head of Mountain clouded yellow butterfly {Colias phicomone} showing eyes, Austria, June.

Alex Hyde / Mountain Clouded Yellow butterfly {Colias phicomone} on branch, Austrian Alps, June.

Silvia Reiche / Mountain Clouded Yellow (Colias phicomone) butterfly, Hohe Tauern National Park, Austria

Thomas Marent / Mountain Clouded Yellow (Colias phicomone) butterfly foraging, Switzerland

Elio Della Ferrera / Yellow butterfly {Colias phicomone} feeding on Black vanilla orchid {Gymnadenia nigra}, Alps, Italy

Robert Thompson / Mountain clouded yellow butterfly (Colias phicomone) on clover flower, Kandersteg, Switzerland, June

Heather Angel / Ant (Formicidae) nectaring on Geraldton waxflower (Chamelaucium uncinatum). Western Australia Botanic Garden, Kings Park, Perth, Australia. November.

Heather Angel / Geraldton wax flower (Chamelaucium uncinatum), nectar fluorescing in UV light. Western Australia. Controlled conditions, focus stacked. Series 1/2.

Heather Angel / Geraldton wax flower (Chamelaucium uncinatum) in visible light. Western Australia. Controlled conditions, focus stacked. Series 1/2.