We have an adult Muscovy drake, named Tom at the bigger lake I go to. He used to have a companion, but he or she has disappeared. A lady who watches over the geese and ducks said they were going to take Tom to another area where he could find a mate, but was told that she couldn't do it because of the mating for life issue. I told her that I didn't think they mated for life, but I didn't want to argue with her, plus I wasn't sure. Tom has mated with mallards before, but not that often. We only have a few mule ducks around the lake. I have doubts as to whether the other Muscovy companion was a female because I've never seen Muscovy ducklings there. Here is a picture of Tom: He's always been nice to me. Sometimes, he gets into a mood and puffs air in and out loudly like a hiss. That's when I just leave him alone. Most of the time, he's mellow.