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]

The Collaborative International Dictionary of English v.0.48:

Tufted \Tuft"ed\, a.
   1. Adorned with a tuft; as, the tufted duck.
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   2. Growing in tufts or clusters; tufty.
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            The tufted crowtoe, and pale jessamine. --Milton.
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            Tufted trees and springing corn.      --Pope.
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   Tufted duck (Zool.), the ring-necked duck. [Local, U. S.]
      [1913 Webster]