the emu ("dromaius novaehollandiae") is a large flightless bird. it is native to australia. the emu is the tallest bird from australia. it is also the second tallest bird in the world, after its ratite relative, the ostrich. the emu is also related to the cassowary which is slightly smaller but heavier. it should also be noted, as an odd fact, that the emus won a war against australia.