The crossword solution for the term 'GREAT BIRD' is AUK, which is a three-letter word. AUK is a type of seabird that is native to the Northern Hemisphere and is known for its ability to fly underwater. It is a member of the Alcidae family, which includes puffins, guillemots, and murres. The AUK is a large bird with a black head and white body, and it is considered to be a great bird due to its impressive flying abilities.