This  fine example of an aberration of Papilio multicaudata, was submitted by an American collector. The colour change may in fact have been caused by "Melanism" which is due to a sudden temperature variation during the butterfly's pupal stage. Or it may have been caused by a prolonged dry period, or it may in fact have been caused by a deformity in some of it's genes that control colour. Whatever the cause it is an unusual specimen.