Black and not-so-Black Waterfoul

As I happened to be in the vicinity of Kelly's Swamp this morning I went in to see what was floating, or wading around.  Seeing was a tad difficult due to the amount of reeds that are invading the swamp.  However from one of the hides I spotted a rather unusual looking duck.
I have shown it to the left in this image so as to include a 'normal' Pacific Black Duck (PBD) for comparitive purposes.  I have asked the members of the COG chatline their opinions as to whether this is an albinistic PBD or a hybrid with some other mallard-oriented species.  My initial guess is that it is a hybrid based upon the normal colouring around the supercilium (aka eyebrow).

Advice from members of COG is that it is a partial albino.  Hybrids with mallards usually have orange feet and legs and curly tail feathers,  This bird doesn't have those attributes.  Also the mallard hybrids are usually much larger than the PBDs, and this one is similar in size to the standard duck.

The second photograph shows the bird co-existing peacefully with a Black Swan.
There was less peace when the pale duck was spotted by Purple Swamphens.  They chased it quite vigourously, despite ignoring the 'normal' PBDs.

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