From The Complete Field Guide to Butterflies of Australia, by Michael F. Braby
Male and female morphologies of the Cairns Birdwing (Ornithoptera euphorion) butterfly of Australia. Top row shows the upperside, the bottom row the underside. Found in the Wet Tropics and Mackay district of Queensland, the Cairns Birdwing is the largest endemic Australian butterfly - females can reach a wingspan of 150mm.
This is just one of the butterflies some friends and I will be looking at in an observational study of butterfly colour preferences for University.