Ynghylch

The clouded yellow is a medium-sized, golden-yellow butterfly. It is a migrant species that flies here from North Africa and southern Europe. Clouded yellows are appear in small numbers most years, but occasionally turn up en masse - long remembered as 'Clouded yellow years'. Adults may arrive at any time during the spring and summer, and can be found in a variety of open habitats, although, in southern England, they are particularly fond of chalk grassland. Foodplants of the caterpillars include wild and cultivated clovers and common bird's-foot trefoil.