Nevertheless, some of the species, both of those found in other parts of the world and of those confined to the archipelago, are common to the several islands; and we may infer from the present manner of distribution that they have spread from one island to the others.
Dena den, espezieetako batzuk, hala munduko beste leku batzuetan aurkitzen direnak, nola artxipelagora mugatzen direnak, irla gehienetan bizi dira, eta, egun duten banakuntza modua kontuan hartuz, irla batetik bestera hedatu direla deduzi dezakegu.