As with birds the individuals of the same species, inhabiting the same country, vary extremely little, I have particularly attended to them; and the rule certainly seems to hold good in this class.
Txorietan herrialde berean bizi diren espezie bereko banakoek diferentzia oso gutxi dutenez, arreta berezia eman diet; eta badirudi klase honetan araua egiaztatu egiten dela.