You'll notice that the ducks will dunk prior to flapping. After most conflicts, they'll dunk and during preening and after mating, they'll dunk and flap.
You need a higher shutter speed and may have to bump up the ISO a notch to get it all to work out. Remember, photography is a game of give and take while out in nature and you need to sacrifice one of the setting to get the shot.
Higher ISO adds a bit of grain, but allows for a faster, richer shot if set on shutter priority, or "S" on your camera Clew.

I will give it a try.

I began to bump up the contrast on my pictures as they were not showing well as I thought they could. Is that a bad thing? Is there something else I should do? By my monitor, they show up very light.