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White is a masking color - it is located in a different place in the genome than most other colors, and it's presence basically bleaches them out - you can have a bird that has interesting color genetics, but just looks white - when you breed this bird (in a combination that causes the masking white to not show up) - all sorts of things can pop out. Fawn and White has similar results.What a cutie! I don't know much about duck genetics, though. While the darker duckling at first might seem to indicate the black call drake was involved, I am not sure if there could be some recessive genes carried by your runners.
Ducks are active both day and night and that's why many don't go into a shed at night without proper persuation. Wild mallards tend to forage on land during the nighttime. If you let them, they would actually be quite busy foraging.