I think you are right. After looking at mine this evening I think we have white Muscovy. The pale beaks that are tipped down at the end. Mine have longer claws, and have been making the Muscovy purring sound. So very exciting. They both were the same size at first but now one is much larger. Perhaps I have a male and female
Yep I think they are! My male is getting so huge and he can't support his weight for very long before he lays down. Sometimes his legs even start shaking. I give them brewer's yeast every day but it hasn't helped. He acts normal otherwise and runs around in the yard but takes more rests than the female.