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Published online 18 January 2000 | Nature | doi:10.1038/news000120-6

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Sex-crazed butterfly swarms

The bacteria Wolbachia drives some female butterflies in which it lives to take desperate measures in their hunt for new mates, reports Eleanor Lawrence.

The 18th century satirist Jonathan Swift, of Gulliver's Travels fame, once remarked: "So, naturalists observe, a flea / Hath smaller fleas that on him prey / And these have smaller fleas to bite 'em / And so proceed ad infinitum."

He might have made much of the effects of the bacterium Wolbachia, a parasite which has an even more unfortunate effect on one of its hosts, the African butterfly '_Acraea encedon_', also known as the Common or White-barred Acraea.

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