Identifying features
Wingspan: 40-50 mm. Common clouded yellow is orange, but appears yellow in flight.
Similar species
It is unlikely to be confused with pale clouded yellow. In flight its yellow colour is much brighter than that of pale clouded yellow.
Distribution
Most observations in Southeast Denmark, and often along the coastlines. Certain years see invasions of this species, most recently in 2009.
Biology
Also a migratory species, though far less common than pale clouded yellow and considerably more heat-demanding. The egg is laid as with pale clouded yellow, primarily on lucerne and other pea flowers.