With wing-spans of up to nearly 10 inches, the genus Attacus includes the largest moths of South East Asia, and they are among the largest found in the world (New Guinea has the largest butterfly, the protected Queen Alexandra's Birdwing, Troides (Ornithoptera) alexandrae, but this species, the female of which is comparable in size to an atlas moth, is not found in the Madang area). The very large Attacus caterpillars are spiny, and feed on a variety of trees, including Ailanthus and Berberis.