Whereas, among spouting fish the tail, though it may be similarly shaped, invariably assumes a horizontal position.
By the above definition of what a whale is, I do by no means exclude from the leviathanic brotherhood any sea creature hitherto identified with the whale by the best informed Nantucketers; nor, on the other hand, link with it any fish hitherto authoritatively regarded as alien.*
Chapter 32, Cetology · verse 19
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