For those that don't have access to the books mentioned, here
are a couple places that show a photo of the bird.

http://www.sjliving.com/happyhollow/website/Whistling_duck.html

http://users.carib-link.net/~wildfowl/wft/birds.htm

Jerry Converse
Grand Coulee, WA
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Never be afraid to try something new.
Remember, amateurs built the Ark and
Professionals built the Titanic.