What is the scienific name for the common duck?

The most common duck might be one of three species. The very common wild Mallard duck's scientific name is: anas platyrhynchos platyrhynchos

There are two white domestic ducks: The Peking Duck: anas platyrhynchos

and the Muscovy Duck: cairna moschat

The Muscovy and Peking duck differ in appearance with the Muscovy having a red face. The Piking is all white.