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plural blue whales
A whale (Balaenoptera musculus), blue in color and the largest known living animal. quotations examples
But there are a rabble of uncertain, fugitive half-fabulous whales, which as an American whaleman, I know by reputation, but not personally....the Iceberg whale; the Quog Whale; the Blue Whale. But I omit them as altogether obsolete and can hardly help suspecting them for mere sounds full of leviathanism, but signifying nothing.
1851, Herman Melville, Moby Dick, page 131