The Tailed emperor (Polyura (pyrrhus) sempronius) is a large butterfly by Australian standards, with a wingspan of some 75(♂)–85(♀) mm, that occurs in a variety of habitat types. The uncommon but widespread butterfly is found in northern and eastern Australia, where it occurs predominantly in the warm and subtropical coastal regions. It is a resident species where its food plants, certain legumes (Mimosaceae and Caesalpineaceae) and Kurrajongs, are native.