Wingspan 75 - 95mm. The fore-wings are a mixture of camouflage greys. The hind-wings are kept covered until the surprise is needed when they are revealed to show black and blue eye-spots on a bright pink background. There is a large black mark in the middle of the thorax.
Where willows, the larval food plant, grows.
Status and distribution
Common and widespread in lowland England and Wales. Common in Nottinghamshire and at Netherfield Lagoons.
Best time to see
May to July.