The term EMU OR RHEA is a crossword solution for the word RATITE, which is a type of bird. Ratites are flightless birds that have a flat breastbone and lack the keel structure that other birds have, which allows them to fly. The two most common ratites are the emu and the rhea. The emu is native to Australia and is the second-largest living bird in the world, while the rhea is native to South America and is the largest bird in the Americas.