I have 2 Blue Swedish ducks that I would like to know what sex they are. Sorry no pics right now. I do have 1 male that tries to mate them but he also tries to mate another male so that's no help.
Usually the male will have a darker head and a deeper voice. The female would be smaller and more submissive to the male. It would be easier to help you if I could see a picture. The male is always bigger than the female.
I agree.The boy should have a different colored head. Almost like mallards have rings except no white ring and not such a drastic change in color. Look for a a few curly feathers above the tail. Thats the drake curl. Pics?