bluebill definition

  • noun:
    • See scaup.
    • the scaup (of genus Aythya)
    • Spermophaga, estrildid finches present in tropical Africa.
    • A duck for the genus Fuligula. Two American types (Fuligula marila and Fuligula affinis) are normal. See scaup duck.
    • A scaup duck; the blackhead (which see).
    • diving ducks of the united states having a bluish-grey costs

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