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As you suspected, in general it's not realistic that a duck would raise a swan, especially in the wild. INCUBATION: A swan's egg is much bigger than a mallard's, so the mother mallard (hen) is ...
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As you suspected, in general it's not realistic that a duck would raise a swan, especially in the wild. INCUBATION: A swan's egg is much bigger than a mallard's, so the mother mallard (hen) is ...