The Clouded Yellow is a migratory European butterfly and is a regular visitor to the UK, including many parts of Scotland. Although some are seen every year, only about 500 normally reach the UK from southern Europe. However, the species is famous for occasional mass immigrations, which are remembered as "Clouded Yellow Years". Its underwings are greenish yellow with two silver-white spots and the upperwings are deep orange-yellow with broad dark wing margins. It always rests with wings closed. Favourite plants include clover, thistle, knapweed and marjoram. In flight, it travels fast and far, mainly from May to October, and does not survive our winters. Easily disturbed, Clouded Yellow butterflies are difficult to approach.
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