Leigh Fermor uses an evocative triologism to describe how island cats replenish their stock with outside strains. You can imagine a tom-cat leaping from boat to pier and returning the next morning, having helped enhance local feline genetic diversity.
It must surely be the same with island cats, interbred for generations in steep un-cat-like habitats with only an occasional outside strain that comes to flower after the brief visit of some caique-dwelling tom.
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Source: Patrick Leigh Fermor, Mani: Travels in the Southern Peloponnese (New York: New York Review of Books, 2006 (1958)), p. 302