The mussel, or pina as it is called in Greek, is a large bivalve which enters into a sort of Penelope with the tiny shrimp to procure food, and so, when little fishes swim into the gaping shell, the shrimp draws the attention of the mussel and the mussel shuts up its shells with a snap; thus two very dissimilar creatures obtain their food in common. In this case we are curious to know whether their association is due to a sort of mutual compact, or whether it was brought about by nature herself and goes back to the moment of their birth.
Cicero, De natura deorum, 48
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