When we see any part or organ developed in a remarkable degree or manner in a species, the fair presumption is that it is of high importance to that species: nevertheless it is in this case eminently liable to variation.
Espezie batean atal edo organoren bat ezohiko gradu edo moduan garaturik ikusten dugunean, organo edo atal hori espezie horrentzat oso garrantzizkoa dela da arrazoiko aurreustea, eta, hala ere, kasu honetan, aldakuntzaren mende dago erabat.