The term 'bird similar to an ostrich' can be summarized by two crossword solutions: EMU (3 letters) and RHEA (4 letters). The EMU is the second-largest living bird in the world, native to Australia. It has a long neck, brown feathers, and long legs. The RHEA is a large flightless bird native to South America. It has a long neck, gray feathers, and long legs. Both birds are similar to ostriches in size and shape.