If its natural power of increase be allowed to act, it can succeed in increasing (the country not undergoing any change in conditions) only by its varying descendants seizing on places at present occupied by other animals:
Gehitzeko duen ahalmenari iharduten utziz gero, abere honek (herrialdeak bere baldintzetan aldaketarik ez duela jorik) bere ondorengo aldatuek beste animalia batzuek beterik dituzten lekuak harrapatuz ez bestez lor lezake gehitzea: