RE: Cool looking duck
I have seen ducks like that before as well. I have been told that they are black and mallard crosses by other hunters, but I disagree. I have seen a lot of black/mallard hybrids, and none of them look like that.
I don't know about the old mallard hen theory, never heard that take on it before.
Personally, I think it looks more like a widgeon/mallard than anything else. The other one I have seen (personally, then add this one on the web), had a bit more blue in the bill and the feet were more grey. Also had more red/auburn on the chest.
Have also heard gadwall/mallard before. Who knows...