What crossesare sterile? muscovy and...?

[KWAK]

I know mallard derrived birds crossed with muscovy are sterile...
But what breeds can I cross with them for offspring that arent sterile?

 

[FarmrGirl]

Muscovy are a different species than Mallard derived ducks. The only non-sterile offspring will be with other Muscovy.

 

[Oregon Blues]

You'll have to verify this because I am going from memory.

Muscovy are shelducks. So you could cross them with other shelducks. However, as far as I know Muscovy are the only domesticated shelducks. I don't think anyone even keeps them as ornamentals.

They are closer related to geese than to mallard derived domestic ducks. But you can't breed them to geese, either.