The crossword solution for the term 'songbird with dark, iridescent plumage' is STARLING. Starlings are a type of small to medium-sized passerine bird in the family Sturnidae. They are native to Europe, Asia and Africa and have been introduced to Australia and the Americas. Starlings are highly sociable birds and often form large flocks. They have glossy black plumage with an iridescent sheen and are known for their complex vocalizations.