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Knud Hald: Tufted duck
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Knud Hald: Eurasian coot, (Fulica atra)
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Knud Hald: MALLARD, female, platyrhynchos
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Knud Hald: Mallard, Anas platyrhynchos, male and female
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Knud Hald: Mallards on the ice
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Knud Hald: Black-headed gulls on ice
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Knud Hald: Tufted duck in Olsbæksøen in Greve, Denmark