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If she's larger than that rouen then she's still a rouen. There are no others bigger that look like that. There are 'gray' call ducks and 'gray' runners, both of which have the same coloring as the mallards and rouens but the rouens are the biggest.
Woot all this info is awesome. I know this isn't my thread but my search for incubating duck eggs found it. I was looking for the time frame and humidity. Perfect.