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Colias croceus, also known as the clouded yellow, is a small butterfly of the family Pieridae, the yellows and whites. Its breeding range is North Africa and southern Europe and eastwards through Turkey into the Middle East, but it occurs throughout much of Europe as a summer migrant, sometimes as far north as Scandinavia. In Asia, its range extends into central Siberia in the north and barely into India in the south, although it is not found in Central Asia. The species can live in any open area in the countryside, including downland, coastal cliffs and fields containing the caterpillar's host plants, at an elevation up to 1,600 metres (5,200 ft) above sea level. Colias croceus has a wingspan of 46–54 millimetres (1.8–2.1 in), with the upperside of its wing being golden to orange yellow with a broad black margin on all four wings and a black spot near the centre forewing. This mating pair was photographed in Pirin National Park, Bulgaria.

Photograph credit: Charles J. Sharp

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