The crossword solutions for the term 'bird flightless' include the MOA (3 letters), EMEU (4 letters), OSTRICH (7 letters), RHEA (4 letters), DODO (4 letters), KIWI (4 letters), EMU (3 letters), and PENGUIN (7 letters). All of these birds are flightless, meaning they cannot fly. The MOA is an extinct species of bird native to New Zealand, while the EMEU is a large, flightless bird native to Australia. The OSTRICH is the largest living species of bird and is native to Africa, while the RHEA is a large, flightless bird native to South America. The DODO is an extinct species of bird that was native to the island of Mauritius, while the KIWI is a small, flightless bird native to New Zealand. The EMU is a large, flightless bird native to Australia, and the PENGUIN is a flightless bird native to the Southern Hemisphere.