Many authors of classic antiquity tell us about a taboo to enter the holy island where Osiris is buried. But it is only Plutarch who says that even birds and fishes stay away from that place. Indeed Egyptian sources attest a prohibition on entering the island. But that does not apply to birds or fishes, though it is said that it is forbidden to hunt these animals in the closer sphere of the tomb of Osiris. The present article shows that a mistranslation of an Egyptian verb made by Plutarchs interpreter could be the reason for his unique message.