Mystery Thanksgiving Duck

Mike Boston sent a picture and asked about this weird-looking duck he photographed at the Wastewater on Thanksgiving Day:

I had no idea what it was and sent the photo to Charlie DeWitt who replied: 

This is a picture I took on 11-15-2013 at the Wastewater.  It looks a lot like the duck Mike photographed. White-cheeked Pintail face and Wigeon butt.

If anyone else has thoughts about these ducks, we'd like to hear them.  Thanks!

- Ric