I've said that the white witch moth is perhaps the largest insect in the world. People debate about that. Wikipedia says: "the white witch, Thysania agrippina, has the longest recorded wingspan of ... any living insect, at up to 30 cm (12 in)." The largest butterfly might be Queen Alexandra's birdwing, that has a little shorter wingspan than the white witch, but greater wing area. This butterfly from Papua New Guinea is really beautiful, and is endangered.