Origin of Species by Means of Natural Selection

Origin of Species by Means of Natural Selection, (PROSE: The Age of Ambition) On the Origin of Species (AUDIO: War Wounds) or The Origin of the Species (COMIC: Cuckoo) was written by Charles Darwin. (PROSE: The Age of Ambition) It concerned his scientific theory of evolution. (COMIC: Cuckoo)

The Seventh Doctor once remarked that an extra-terrestrial fossil in the caves around the Lifton coast was a "cuckoo [that needed to be pushed] out of the nest of human history", else Charles Darwin's The Origin of the Species might never be written, since the fossil could not be integrated into Darwin's theory of evolution. (COMIC: Cuckoo)

The Twelfth Doctor kept a copy of On the Origin of Species next to the Bumpty annual in one of his bookshelves in the TARDIS control room. (AUDIO: War Wounds)

Behind the scenes
The more accurate title in the real world is On the Origin of Species by Means of Natural Selection, or simply On the Origin of Species, as used in War Wounds.