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Satsuma snails with counterclockwise shells are less likely than clockwise-shelled snails to be eaten by snail-eater snakes. This advantage, suggested Japanese biologists, may explain why sinistral snails are so successful in spite of having their genitals on the wrong side.

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Satsuma snails with counterclockwise shells are less likely than clockwise-shelled snails to be eaten by snail-eater snakes. This advantage, suggested Japanese biologists, may explain why sinistral snails are so successful in spite of having their genitals on the wrong side.

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