Ostrich kin are a group of large, flightless birds that include the EMU (3 letters), rheas (5 letters), emus (4 letters), and RHEA (4 letters). The EMU is native to Australia and is the second-largest living bird by height. Rheas are native to South America and are the largest species of ratite. Emus are also native to Australia and are the largest bird in Australia and the only extant member of the genus Dromaius. Lastly, the RHEA is native to South America and is the smallest species of ratite.