Peacock Butterfly - Aglais Io Stock Photography

Peacock Butterfly - Aglais io. The Peacock is a familiar sight in gardens across the British Isles and is unmistakable, with quite spectacular eyes on the upperside of the hindwings that give this butterfly its name. These eyes must appear very threatening to predators, such as mice, that confront this butterfly head-on, where the body forming a `beak`, as shown in the image below.