The two became friends. John Henslow suggested that Charles Darwin take the unpaid position of naturalist for a trip on the British ship H.M.S.Beagle.

VOA: special.2009.02.25

John Darwin and his wife Anne were convicted of insurance fraud in 2008 over the faking of his death.

BBC: John Darwin email 'hacking' case dropped by CPS

The giant tortoises, mockingbirds and finches varied from island to island, and this became clearer to Darwin after London Zoo's bird expert John Gould analysed his finches in January 1837.

BBC: Darwin's twin track: 'Evolution and emancipation'