The Clouded Yellow butterfly (Colias croceus) is a migratory species occasionally seen in the United Kingdom, known for its striking yellow wings with black margins. It is not a native species but is known to visit the UK during occasional mass migrations from continental Europe, particularly in late summer and early autumn.

Clouded Yellow butterflies primarily feed on the nectar of various flowering plants such as clovers, thistles, and knapweeds. As caterpillars, they feed on plants from the legume family, including clovers and vetches. Their adaptable feeding habits allow them to thrive in diverse habitats where nectar sources are abundant.

In terms of behaviour, Clouded Yellow butterflies are known for their swift and erratic flight patterns, often seen darting among flowers and foliage in search of food and mates. They are migratory creatures, capable of covering long distances in search of suitable breeding grounds.

The lifespan of a Clouded Yellow butterfly typically ranges from one to two weeks for adults, with multiple generations emerging throughout the summer months. Their lifecycle is closely tied to the availability of food plants and suitable breeding habitats.

Culturally, the Clouded Yellow butterfly has been depicted in various artworks, literature, and folklore as a symbol of transient beauty and freedom. Its migratory behaviour and vibrant coloration evoke feelings of wanderlust and adventure.

An interesting fact about the Clouded Yellow butterfly is its occasional mass migrations, known as “Clouded Yellow years,” when large numbers of individuals arrive in the UK from continental Europe. These migrations can lead to temporary population booms and are eagerly awaited by butterfly enthusiasts.