The phrase “arrival of the fittest” is seen and heard from time to time, often contraposed with the phrase “survival of the fittest” (due to Herbert Spencer, but adopted by Darwin in the fifth and sixth editions of the Origin). Typically it is used in making the claim that natural selection cannot by itself account for evolution because selection must have variation upon which to act. Thus natural selection (it is claimed) explains the survival but not the arrival of the fittest. The rhyme between “arrival” and “survival” is catchy, and it’s not surprising that Google Scholar lists almost six hundred articles containing the phrase “arrival of the fittest,” with eighteen articles containing it in their title. There are also at least three books with the phrase in their title, of which the most recent is Arrival of the Fittest: Solving Evolution’s Greatest Puzzle (2014), by Andreas Wagner.