Drake Mallard+hen Black Runner=?

[KansasKid]

I recently had a hen mallard hatch out her eggs and i noticed that there was a almost totally black one in the bunch and the only thing i can figure is that my hen runner laid an egg in her nest. So i got to wondering what else can a mallard mate with?

 

[Natermotor]

Any type of domestic duck.....

 

[1lpoock]

Almost every domestic breed descended from the mallard, therefore; the mallard can mate with all of those....