Butterflies – Clouded Yellow (Colias croceus)

Clouded Yellow

Key facts

The Clouded Yellow is one of the truly migratory European butterflies and a regular visitor to Britain and Ireland. Although some of these golden-yellow butterflies are seen every year, the species is famous for occasional mass influxes and subsequent breeding, which are fondly and long remembered as ‘Clouded Yellow Years’. A small proportion of females are pale yellow (form helice), which can be confused with the rarer Pale and Berger’s Clouded Yellows.


Females generally like males but black borders contain yellow spots.

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