In the 9 years we've lived at Run*A*Round, we've never seen our pond freeze completely over. It's pretty big so it usually just freezes around the edges. Well, last week's 4+ days of well-below-freezing temps finally sealed the deal. Saturday morning it was completely frozen over. Luckily because of sunshine that day, by afternoon it was completely clear again.
I believe these were gadwalls.
The ducks were not so happy in the morning, but were relieved to return to normal by afternoon.