Scaup \Scaup\ (sk[add]p), n. [See {Scalp} a bed of oysters or
   mussels.]
   1. A bed or stratum of shellfish; scalp. [Scot.]
      
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   2. (Zool.) A scaup duck. See below.
      
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   {Scaup duck} (Zool.), any one of several species of northern
      ducks of the genus {Aythya}, or {Fuligula}. The adult
      males are, in large part, black. The three North American
      species are: the greater scaup duck ({Aythya marila}, var.
      nearctica), called also {broadbill}, {bluebill},
      {blackhead}, {flock duck}, {flocking fowl}, and {raft  duck}; the lesser scaup duck ({Aythya affinis}), called
      also {little bluebill}, {river broadbill}, and {shuffler};
      the tufted, or ring-necked, scaup duck ({Aythya  collaris}), called also {black jack}, {ringneck},
      {ringbill}, {ringbill shuffler}, etc. See Illust. of
      {Ring-necked duck}, under {Ring-necked}. The common
      European scaup, or mussel, duck ({Aythya marila}), closely
      resembles the American variety.
      
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Ringneck \Ring"neck`\, n.
   1. (Zool.) Any one of several species of small plovers of the
      genus {Aegialitis}, having a ring around the neck. The
      ring is black in summer, but becomes brown or gray in
      winter. The semipalmated plover ({Aegialitis semipalmata})
      and the piping plover ({Aegialitis meloda}) are common
      North American species. Called also {ring plover}, and
      {ring-necked plover}.
      
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   2. (Zool.) The ring-necked duck.
      
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Ring-necked \Ring"-necked`\, a. (Zool.)
   Having a well defined ring of color around the neck.
   
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   {Ring-necked duck} (Zool.), an American scaup duck ({Aythya  collaris}). The head, neck, and breast of the adult male
      are black, and a narrow, but conspicuous, red ring
      encircles the neck. This ring is absent in the female.
      Called also {ring-neck}, {ring-necked blackhead},
      {ringbill}, {tufted duck}, and {black jack}.
      
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