Could be a vagrant Mottled Duck, I suppose. Luke, the male has a bright yellow green bill, the female a dull olive bill. Here is a picture of the same duck and its mate. I didn't post this as it is pretty far off and the mate was not in a good position to ID.
Posted by Luke Ormand on February 19, 2014 at 2:31 AM
Phil - I stand corrected. In the book I was looking at the black duck is shown next to the mottled duck - I mistook the mottled for a "female" black duck
Posted by Richard Teller on February 19, 2014 at 11:20 PM
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