Canada geese, white-fronted geese, emperor geese, Brant geese,
lesser snow geese, Ross geese, and Aleutian geese.
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The number of ghosts that appeared to Ebenezer Scrooge in "A Christmas Carol" is four. The number of geese-a-laying in the "Twelve Days of Christmas" is six. Therefore, the sum of the ghosts multiplied by the geese-a-laying is 4 x 6 = 24.