I have a female tan and white runner and I originally had two male pekings but I gave them away sadly to prevent breeding with my female. I acquired another female duck. Now I'm 95% sure my Indian runner is a female, the voice is a deep quacking and there isn't a curled tail feather. They are both 4 months old. I have noticed however my Indian runner is getting on top of the other female in the bathtub and to me it really looks like mating. Could it be that my Indian runner is a male?