©Margaret Holland
Clouded yellow
Scientific name: Colias croceus
The clouded yellow is a migrant that arrives here from May onwards. Usually, only small numbers turn up, but some years see mass migrations. It prefers open habitats, particularly chalk grassland.
Species information
Statistics
Wingspan: 5.2-6.2cmConservation status
Migrant species.
When to see
May to NovemberAbout
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.How to identify
The clouded yellow has bright yellowy-orange upperwing surfaces, lined with broad, dark edges, and a yellowy-green underside. It rests with its wings closed; two silver-white spots can be seen on the hindwings in this pose.In our area
Although we do not have chalk grassland habitat in the Isle of Man, clouded yellow butterflies have been recorded here as migrants.