I'm here too! I have four Cayuga ducks. I thought all four were female, until yesterday when Squeakers mounted Babbles in the water pond! (I wouldn't have known what the heck they were doing if I hadn't been on here reading) There is no drake feather on him. The first two we got in April, and I loved them so much I got two more in May. They are not laying yet. I had no idea they would breed so early. We were thinking that duck was a male, reading on here about the quacks and the rasp. He is a fatty, too!
He could still be a female! Girl duckies mount each other too. The voice is really what determines it!