Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) one feeding on flower and one in flight, Lieksa, Pohjois-Karjala / North Karelia, Finland, June.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) one feeding on flower and one in flight, Lieksa, Pohjois-Karjala / North Karelia, Finland, June.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno) male and female, Leivonmaki, Joutsa, Keski-Suomi, Lansi- ja Sisa-Suomi / Central and Western Finland, Finland. June

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male, Lapland, Finland, July.

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male, Lapland, Finland, July.

Jussi Murtosaari / Moorland Clouded Yellow butterfly (Colias palaeno) male and female, Joutsa (formerly Leivonmaki), Finland, July.

Wild Wonders of Europe / Benvie / Moorland clouded yellow butterfly (Colias palaeno) on Thistle flower, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Wild Wonders of Europe / Benvie / Moorland clouded yellow butterfly (Colias palaeno) on flowering thistle, Fliess, Naturpark Kaunergrat, Tirol, Austria, July 2008

Thomas Marent / Moorland Clouded Yellow (Colias palaeno) butterfly, Switzerland

Thomas Marent / Moorland Clouded Yellow (Colias palaeno) butterfly, Switzerland

Pal Hermansen / Moorland clouded yellow butterfly (Colias palaeno) resting on a flower, Viken, Norway. July.

Jussi Murtosaari / Moorland clouded yellow butterfly (Colias palaeno), male flying and female resting on flower.