Mallard ducks are used extensively in the production of balut—female (left) and male (right). Balut (/ b ə ˈ l uː t / bə-LOOT, / ˈ b ɑː l uː t / BAH-loot; [1] also spelled as balot) is a fertilized developing egg embryo that is boiled or steamed and eaten from the shell. More @Wikipedia
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