I have several Pekin ducks and can tell difference between drakes and hens, however, a friend of ours was moving so gave us their ducks. They bought them from local pet store. One looks very similar to Pekins however slightly shorter and thinner. I’m sure she is a girl. The other is brown with a slight white ring around neck, and it’s head is a bit darker than body with a little bit of a green shine to it, and beak olive green. It has a Drake feather. But I have defiantly heard it “quack.” Not very often but it does every now and then. I think from google search that they are khaki Campbell. Is the difference in voices as noticeable as with pekins? They are currently in a paddock with a pekin hen. Only getting 2 eggs a day.