The reflections are really fun to play with in the Cypress Swamp. I thought this shot was cool because how the bright white streaks on the water resembled the merganser's markings. They also make good leading lines as well.
Finally getting to posting this. And I apologize for the lengthiness on this post, but waterfowl are one of the most widespread families in zoos.
As per normal, no information older than June 2016 was used, additions and corrections welcomed. I expect this list will have a good number of edits...