Cassowaries, emus and related ratites. The ratites are large flightless birds, and include ostriches, rheas, cassowaries, kiwis and emus. It displays cassowaries, kangaroos, and wombats. Emus, cassowaries, and kiwis show some dimorphism, predominantly in size. Struthioniformes contained all the ratites, such as the kiwis, emus, rheas, and cassowaries. It poses a biogeographical mystery as its closest relatives are Australian emus and cassowaries. The cassowaries are large flightless birds native to Australia and New Guinea. Robert Bino stated that their prey consisted of cuscuses, wallabies, dwarf cassowaries, and other birds. Examples include cassowaries, chickens, crows and related corvids, kea, rallidae, and rheas. Animal groups such as macropods, monotremes, and cassowaries are endemic to Australia. The evolutionary history of cassowaries, as of all ratites, is not well known. Typically, all cassowaries are shy birds that are found in the deep forest. In others, such as the cassowaries, only the male incubates. Reciprocal spirits take place in wild pigs and cassowaries. In areas without other species of cassowaries, it will live in the lowlands also.