Papilio blumei, the peacock or green swallowtail, is a butterfly of the family Papilionidae. It is found only on the Indonesian island of Sulawesi. It is sometimes confused with the more widespread P. palinurus, but that species is smaller and has mostly black tails (in P. blumei, the upper surface of the tails is mostly bluish green). The wingspan of P. blumei is 120–140 mm (4.7–5.5 in). The colours on the wings of some of these butterflies are metallic and are eye catching especially when viewed from a particular angle.