Species: Black-Bellied Whistling Duck (Dendrocygna autumnalis)
Location: South of Picton Ontario in Milford
Normal Range: The Black-bellied Whistling-Duck is a common bird on the Mexico coast. To the south, its range extends throughout Central America, and across much of South America. In the United States, it can be found year-round in parts of southeast Texas, and seasonally in southeast Arizona, and Louisiana's Gulf Coast. It is a rare breeder in such disparate locations as Florida, Arkansas, and South Carolina.
Note: I am not the first birder to originally find this rarity.
Sorry about the link, I have not figured out how to find the image data since they upgraded flickr.
http://www.flickr.com/photos/newfoundlander61/4797262429/