Context:

Referenced when discussing Darwin's theory of evolution and noting that he was too nervous to include his theory about human evolution in this earlier work

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Referenced in discussion of how Sade prefigured Darwinist ideas about survival of the fittest

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Referenced as Darwin's major work where the Galapagos finches feature as evidence for his theory of evolution by natural selection

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Gordon mentions that Darwin 'spends quite a bit of time in origin and species talking about pigeons' in relation to selective breeding and drawing analogies between artificial and natural selection.

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Referenced in discussion about the timing of the Neanderthal discovery, noting it was announced around the same year (1859) as Darwin's famous work was published.

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Mentioned as Darwin's 1871 book that advanced the theory that humans, like all animals, are a product of evolution - the theory he had been too nervous to include in Origin of Species

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Tom quotes from this book at the opening, explaining it's the book in which Darwin 'famously points out that man too is an ape'

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Darwin's published journal from his voyage, first published in 1839 as 'Journal Remarks' and reissued as 'Voyage of the Beagle,' discussed in context of his observations about finch beaks

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Tom mentions that Darwin wrote up his voyage as a book, calling it 'a great book.' Fitzroy also wrote an account of the voyage.