Common Blue (butterfly)

The Common Blue (Polyommatus icarus) is a small butterfly in the family Lycaenidae common throughout Europe. It is often found in meadows or open, hilly areas. Its wingspan is 3 to 3.5 cm. The wings or the male are iridescent blue with a white fringe. The female is usually brown with orange spots on the outer edges of the wing. In some areas the females have a blue coloration to the wings. The undersides of both sexes have a pattern of white, black and orange spots.

The caterpillar is small and pale green with yellow stripes. The caterpillars often feed on bird’s foot trefoil as well as other plants such as clovers and medicks. The chrysalis is olive brown and very smooth. The species over-winters as a caterpillar.