The term 'CASSOWARY's Kin' refers to two species of large, flightless birds native to Australia and New Guinea. The two crossword solutions for this term are 'EMU' (3 letters) and 'Emeu' (4 letters). The EMU is the second-largest living bird by height, after the Ostrich, and is the largest native bird in Australia. The Emeu is a smaller, but still large, flightless bird that is found in New Guinea. Both the EMU and the Emeu are related to the CASSOWARY, and are part of the same family of birds.