I do feed my ducks a little scratch in the morning; they don't eat  much of it, just enough to let the chickens know who's really boss.  They only have access to a baby pool, no ponds or creeks.  The first few months of their life were spent on a tributary of the Chesapeake Bay, where they were "released" when the little Easter ducklings somebody got for their grandchildren got "too big."  I heard about them through the grapevine and brought them to my home on the side of a mountain when they were about 10 weeks old.  It took about two hours to catch little Midge, limboing in a kayak under the piers. Though Midge and Sal are both males, they have had a beautiful relationship with my female Pekin Pong, who was hiding behind another snow mound.  Pong is actually less yellow than the boys.
I started puttering with this picture on Photoshop after I posted it here (duh!) I get the color balance right on the screen and then it's not the same on paper.  No kidding about the variety of "whites" out there.  I spent an hour picking out which white hue I wanted for my porch door.