Casuarius casuarius johnsonii
They belong to a family of birds called ratites and are related to the Emu, the Ostrich, the Kiwi (though there is a dramatic difference in size) and the South American Rhea - a little known bird that resembles a small emu and runs around plains in Patagonia. They are also related to the now extinct Moas of New Zealand and the Elephant Bird of Madagascar. In New Guinea there are two other species of cassowary too but in Australia the only species is the Southern Cassowary
The cassowary (Casuarius casuarius johnsonii) has been wandering around this planet since before the super continent Gondwana broke up in to several continents, and they have relatives in several distant continents.