blue duck

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blue duck (plural blue ducks)

  1. A species of duck, Hymenolaimus malacorhynchos, native to New Zealand.
    Synonym: whio
    • 2000, Errol Fuller, Extinct Birds, Oxford 2000, p. 83:
      Trout, which have been introduced to New Zealand waterways, may also pose a threat to blue ducks since they almost certainly compete with them for the aquatic insects on which the birds depend.