I have a question, I can add pics tomorrow, I have 3 runner mixes, they are siblings with black runner mom and khaki campbell dad. I have a black male, a brown female for sure and a brown of questionable gender. It is a chocolate brown but not a solid color (looks how a female mallard looks, different shades of brown) it's beak is green and feet are a yellowish brown. It does not have a loud girl quack but chatters like a girl but it is raspy. I am wondering what sex it might be? I don't know how the coloring works as far as genetics go but somewhere I read if you bread a brown male to black female all the girls will be brown and all boys will be black? Any truth to that? Or is that a crock of duck poo? I do not want any males so I need to get this figured out soon so they can go to their new home. I obviously don't want to prematurely get rid of them to later find out it is a girl. Thoughts?