I tried posting this in another online forum without a definitive result. Hoping for more feedback here. It was suggested that it's a Mallard with some domestic genes. Any other theories?
http://www.flickr.com/photos/soundart/8023615472/in/photostream
http://www.flickr.com/photos/soundart/8023620632/in/photostream/
http://www.flickr.com/photos/soundart/8023615472/in/photostream
http://www.flickr.com/photos/soundart/8023620632/in/photostream/