El número de huevos de la mosca en el párrafo nonagésimo tercero de El Origen de las Especies

  Efectivamente, el número de indivíduos de una especie no depende sólo del número de huevos.   93. The only difference between organisms which annually produce eggs or seeds by the thousand, and those which produce extremely few, is, that the slow breeders would require a few more years to people, under favourable conditions, a whole district, let it be ever so large. The condor lays a couple of eggs and the ostrich a score, and yet in the same…