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48 millions years of evolution
"This whale, among the English of old vaguely known as the Trumpa whale, and the Physeter whale, and the Anvil Headed whale, is the present Cachalot of the French, and the Pottsfich of the Germans..."
Herman Melville, "Moby Dick, Or the Whale", 1851.
All Cetaceans are marine mammal descendants of land mammals such as the Pakicetus not unlike the dog in this image.