Casuariiformes Casuariiformes The Casuariiformes is an order of large flightless bird that has four surviving members: the three species of cassowary, and the only remaining species of emu. They are divided into either a single family, Casuariidae, or more typically two, with the emu splitting off into its own family, Dromaiidae. All four living members are native to Australia-New Guinea, but some possible extinct taxa occurred in other landmasses. The emus form a distinct family, characterized by legs adapted for running. As with all ratites, there are several contested theories concerning their evolution and relationships. As regards this order, it is
The Birds of Australia (Mathews) has stressed largely the nomenclatural aspect, a phase of ornithology which received little attention from John Gould in the eight folio volumes of his highly valued work, "The Birds of Australia". Gould seldom listed a date, and therefore he failed to recognize occasionally that another name listed by him was really older than the name used by him. He was a firm believer in the use of the prior name; this he showed by changing when necessary to an older name. These two great ornithological works which have the same title, and of which Australians are justly proud are thus