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Published online 3 January 2008 | Nature | doi:10.1038/news.2007.405

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The battle of the butterflies and the ants

Parasitic caterpillars show local evolution as never before.

Butterflies that trick ants into helping to raise their young are driving an evolutionary arms race between the two species, researchers have found. The discovery is important to the conservation of rare Alcon blue butterfies, they say.

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