Ornithoptera alexandrae, the Queen Alexandra's birdwing, is the largest butterfly in the world, with females reaching wingspans slightly in excess of 25 cm (9.8 inches). It is restricted to the forests of the Oro Province in eastern Papua New Guinea. The species is endangered, and is one of only three insects (the other two being butterflies as well) to be listed on Appendix I of CITES, making international trade illegal.