The Collaborative International Dictionary of English v.0.48:
mandarin duck \mandarin duck\ n. A showy crested Asiatic duck (Aix galericulata, formerly Dendronessa galericulata), often domesticated, and regarded by the Chinese as an emblem of conjugal affection. [1913 Webster + WordNet 1.5]WordNet (r) 3.0 (2006):
mandarin duck n 1: showy crested Asiatic duck; often domesticated [syn: mandarin duck, Aix galericulata]