mal·lard 
(mălərd)
(mălərd)n. pl. mallard or mal·lards
A wild duck (Anas platyrhynchos) found almost worldwide, the male of which has a green head and neck. Most domestic ducks descend from the mallard.
[Middle English malarde, from Old French maslart, malart, wild mallard drake, drake, probably from masle, male; see MALE + -art, -ard, -ard.]