I have 2 ducks that I bought before they were old enough to tell what gender they were. Recently they both developed curled tail feathers. However, I just saw one duck mounting the other while holding onto the neck of the other. I'm guessing this is something male ducks possibly do to each other, but is there a possibility one is male and one is female? They both also have the same quack (sort of quiet). The only differences between them is that one is slightly larger and has a darker beak.
