I bought a couple of Cayugas ducklings from someone off of Craigslist, and I am starting to think they are both drakes. We have had them for a week, have not heard anything but whistles, and they are about 6-7 weeks old. Can anyone tell me if I still have hope for a hen from these two? Forgive the pictures of my 4 week old mixes also in the pics! Thanks in advance!!!