Cassowaries are large, flightless birds native to Australia and New Guinea. They are related to emus, which are also large, flightless birds found in Australia. The term 'cassowaries' is derived from the Malay word 'kasuari, ' which means 'horned head.' The two crossword solutions for the term 'cassowaries' are 'emeus' (5 letters) and 'emus' (4 letters). Both of these words refer to the emu, a species of flightless bird that is closely related to the cassowary.