Muscovy and mallard aren't the same species. If they were, they would produce fertile offspring, and they don't.
Varieties and breed aren't the same thing. Just like chickens, you can have the breed (Buff ducks, Swedish ducks, leghorn chickens, ect) and have several colors recognized in that...
I guess maybe Mozart? The story (idk if it's true or not, but its still hilarious) of how he wrote a song just to mess with a singer he didn't like always makes me laugh
No, like Chickens, the SPECIES is duck which is divided into breeds. Just like chickens, you can work to introduce traits into breeds they don't originate from, but they are still seperate breeds