Among many remarkable qualities they have been distinguished from the earliest times by a species of commensalism, or power of living among other nations without becoming either socially merged or politically distinct.
Commensalism occurs in a few instances, but parasitism either external or internal is rare.
From this we may pass through various grades of " commensalism," like that of the hermit-crab with its protective anemones, to the cases of actual parasitism.
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