Mystery of the white ducks

White ducks I (Credit: Celia Her City)

Every summer a pair of white ducks shows up on the North Pond.

White ducks III (Credit: Celia Her City)

Of all the water birds, I think they are my favorite.

White ducks II (Credit: Celia Her City)

But what are they?  I mean in a taxonomic sense . . . and can they make it through the winter?  Do they migrate?

If you know anything about white ducks, feel free to write in.

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