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domestic duck

n. 1 The domesticated variety of mallard, ''Anas platyrhynchos''. 2 Any duck that has been domesticated.

Wikipedia
Domestic duck

Domesticated ducks are ducks that are raised for meat, eggs and down. Many ducks are also kept for show, as pets, or for their ornamental value. Almost all varieties of domesticated duck are descended from the mallard (Anas platyrhynchos), apart from the Muscovy duck (Cairina moschata).