Alright, I'm starting to worry a little bit. I think all my mallards are drakes! Not that I have a problem with that but I was hoping at least one was female. I wanted peaceful hens and eggs not testosterone driven goof heads. The reason I suspect all drakes is because they are all developing a light green sheen on their backs, one sounds raspy and has a green sheen on his head already, he is also the biggest. I could have sworn I heard one quacking though, sooo, I just don't know. Do female mallard's get a green sheen on their backs when first getting their feathers? I haven't got a good pic of this new color development yet but will post some the second I do.