A wild duck(Anas platyrhynchos) of which the male has a green head and neck. Most domestic ducks descend from the mallard.

• 绿头鸭一种野鸭（绿头鸭），其雄鸟具有绿色的头和颈。大部分驯化了的家鸭都是绿头鸭的后裔