I rescued a couple Muscovy mixed ducks from the river years ago, they were the cutest boys funny as all get out, and It didn't matter to me if they were sterile because I had enough drakes and ducks [Muscovy breed] if I wanted any ducklings. Do you think someone dropped them off at your house?I assume mule as well since it is 100% that he is a male but with no caruncles I figured he may not be full muscovy, plus he's not huge like I've seen with other muscovy males. I wouldn't be able to isolate him with any other girls right now but the one that he's currently with since unfortunately my male to female ratio is awful right now. We have young females that we just added but aren't of "interest" to the boys yet. I have seen him mount my other ducks but not the muscovy female he is with. Doesn't mean he hasn't I just haven't seen it, I would assume as with any male fowl he has to be mating her lol. I would have to try and collect her eggs but I haven't found any laid yet so either she's laying and I'm not aware of location or she's not laying (don't think that's the case) If I can find her location I will look at her eggs and see. I'm hoping he's a mule since I really don't care to have more ducklings that aren't female lol.