The term 'Cassowary Kin' refers to the family of flightless birds that includes the cassowary, emus, rheas, and kiwi. The crossword solutions for this term are EMUS (4 letters), RHEA (4 letters), EMU (3 letters), RATITE (6 letters), and KITH (4 letters). Emus and rheas are large, ostrich-like birds native to Australia and South America, respectively. The EMU is the second-largest living bird by height, after the ostrich. Rheas are slightly smaller than emus and have three toes on each foot instead of two. The kiwi is a small, nocturnal, flightless bird native to New Zealand. Ratites are an order of birds that includes all species of flightless birds, such as the cassowary, EMU, RHEA, and kiwi.