shelduck
    n 1: female sheldrake

Goosander \Goos"an`der\, n. [OE. gossander, a tautological word
   formed fr. goose + gander. Cf. Merganser.] (Zool.)
   A species of merganser (M. merganser) of Northern Europe
   and America; -- called also merganser, dundiver,
   sawbill, sawneb, shelduck, and sheldrake. See
   Merganser.
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Sheldrake \Shel"drake`\, n. [Sheld + drake.]
   1. (Zool.) Any one of several species of large Old World
      ducks of the genus Tadorna and allied genera, especially
      the European and Asiatic species. (Tadorna cornuta syn.
      Tadorna tadorna), which somewhat resembles a goose in
      form and habit, but breeds in burrows.
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   Note: It has the head and neck greenish black, the breast,
         sides, and forward part of the back brown, the
         shoulders and middle of belly black, the speculum
         green, and the bill and frontal bright red. Called also
         shelduck, shellduck, sheldfowl, skeelduck,
         bergander, burrow duck, and links goose.
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   Note: The Australian sheldrake (Tadorna radja) has the
         head, neck, breast, flanks, and wing coverts white, the
         upper part of the back and a band on the breast deep
         chestnut, and the back and tail black. The chestnut
         sheldrake of Australia (Casarca tadornoides) is
         varied with black and chestnut, and has a dark green
         head and neck. The ruddy sheldrake, or Braminy duck
         (Casarca rutila), and the white-winged sheldrake
         (Casarca leucoptera), are related Asiatic species.
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   2. Any one of the American mergansers.
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   Note: The name is also loosely applied to other ducks, as the
         canvasback, and the shoveler.
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Shelduck \Shel"duck`\, n. [Sheld variegated + duck.] (Zool.)
   The sheldrake. [Written also shellduck.]
   [1913 Webster]