Man and animals
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John Wilmot, Earl of Rochester
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Sinclaire, Upton. The Jungle. Dover Publications, 2001, ch. 3.
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Dirk Gently's Holistic Detective Agency
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Morris, Desmond. The Naked Ape: A Zoologist's Study of the Human Animal. Jonathan Cape, 1967, introduction.
Wilson, Edward Osborne. "The Little Things That Run the World." The opening of the invertebrates exhibit. 7 May 1987, National Zoological Park, Washington, DC, USA.
Twain, Mark. "The Lowest Animal." Letters from the Earth. Harper & Row, 1962.
Twain, Mark. "The Lowest Animal." Letters from the Earth: Uncensored Writings, edited by Bernard DeVoto. Harper Perennial Modern Classics, 2004.
Pope, Alexander. Letter to Henry Cromwell. 19 Oct. 1709.
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Adams, Douglas. "Fit the Third." The Hitchhiker's Guide to the Galaxy. Primary Phase. BBC Radio 4, London, England, UK, 22 Mar. 1978.
Adams, Douglas. The Hitchhiker's Guide to the Galaxy. Pan Books, 1979, ch. 23.
Leclerc, Georges-Louis. Histoire Naturelle, générale et particulière, avec la description du Cabinet du Roi [Natural History, General and Particular, with a Description of the King's Cabinet]. Paris: Imprimerie royale, c. 1753.