Rare bird is a term used to describe something that is unique, unusual, or hard to find. The two crossword solutions for this term are NENE and ONER. NENE is a species of goose native to Hawaii and is the state bird. It is endangered and is considered a rare bird. ONER is a slang term for a person who is unique and stands out from the crowd. This term is often used to describe someone who is one-of-a-kind and has an individual style.