The term 'Australia Bird' can be broken down into five crossword solutions: EMU (3 letters), ADELAIDE (8 letters), PERTH (5 letters), OPAL (4 letters), and EMUS (4 letters). The EMU is a large, flightless bird native to Australia and the only extant member of the genus Dromaius. It is the second-largest extant bird in the world by height, after its ratite relative, the ostrich. Adelaide is the capital city of South Australia and the fifth-most populous city of Australia. Perth is the capital and largest city of Western Australia. OPAL is a hydrated amorphous form of silica, which is an opalescent gemstone found in various types of rock. Emus are a group of large, flightless birds native to Australia.