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You may wish to consult Cuckoo (disambiguation) for other, similarly-named pages.

A cuckoo was something that was where it shouldn't be. The Seventh Doctor once called an extra-terrestrial fossil in the caves around the Lifton coast 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)

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