Mallard at Mom's

Bob, I love this shot! Love the reflections off the water.

Just as another opinion, I kind of think this shot may be better without the reflections on the water. In my (humble) opinion, I feel the mallard gets lost in them. A polarizer would probably make the duck POP out a bit more, this is assuming your goal was to highlight this guy and not make him blend in. It would also saturate the colors on this bird a bit more. But, I know from experience this is easier said than done...I've shot this same bird with the same result. I think if you cut some glare with a polarizer you would see the ducks legs and make it more of a "portrait" of the duck, but that's just one little opinion. People like Steve obviously feel the opposite way so take it with a grain of salt. As with your other shots though, great composition. You really do a wonderful job of framing and composing...you have quite a talent for that!