[1] : The Collaborative International Dictionary of English v.0.48

ring-necked \ring"-necked`\, a. zool.
   having a well defined ring of color around the neck.
   1913 webster

   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.
      1913 webster
see also:
ring-necked duck aythya collaris ring-neck ring-necked blackhead ringbill tufted duck 
black jack 

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Steamer Duck, definition of term: Steamer Duck
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Wood Duck, definition of term: Wood Duck
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Fen Duck, definition of term: Fen Duck
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