Wow buck... thats confusing.

It definitely looks like a woodie at first glance, but the bill is noticabley thicker and a different color, the tail isn't as broad, and its missing the blue speculum on the wings... It looks lit is has just a little bit of a white ring around the eyes, but that is also not as pronounced as the woodies white eye ring...

I'm not sure what to say on this one. It looks like it could be a mixed duck...

It look almost like a redhead hen, but is missing some distinct features, such as the slightly lighter shaded ring around the front of the bill.