The crossword solution for the term THEY'LL NEVER FLY is EMUS, which stands for the flightless birds of the same name. Emus are native to Australia and are the second-largest living bird by height, after the ostrich. They are known for their long legs and neck, and their ability to run at speeds of up to 50 km/h. Despite their impressive running speed, they are unable to fly due to their lack of wings.