Robin’s Robins

Here's three ducks that I'm not totally sure of. I think they are Gadwalls, but then again?
This single may be a Gadwall/Mallard hybrid. It has an extra stripe on it's wings (the light brown one), but the black and brown stripe are consistent with a Gadwall.

These two, I'm pretty sure are female Gadwalls.

A pair of Gadwalls. The hen was a little camera shy.