Muscovy duck

from WordNet (r) 3.0 (2006)

muscovy duck
    n 1: large crested wild duck of Central America and South
         America; widely domesticated [syn: {muscovy duck}, {musk
         duck}, {Cairina moschata}]

from The Collaborative International Dictionary of English v.0.48

Muscovy duck \Mus"co*vy duck`\ [A corruption of musk duck.]
   (Zool.)
   A duck ({Cairina moschata}), larger than the common duck,
   often raised in poultry yards. Called also {musk duck}. It is
   native of tropical America, from Mexico to Southern Brazil.
   [1913 Webster]