The beautiful peacock butterfly (Inachis io) is a well-known and instantly recognizable species thanks to its unique patterning. The stunning eyespots, which earn this species its common name, frighten predators, or divert birds from attacking the body. In stark contrast to the brightly-coloured upper surfaces, the undersides of the wings are dull brown. The sexes are similar in appearance, but females are slightly larger. The caterpillar, which grows to 4.2 centimetres in length, has a black, spine-covered body freckled with fine white spots.