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Some caterpillers just don't want to grow up

An international project explores why it's an evolutionary advantage that only 25 percent of the caterpillars of Maculinea rebeli, a Lycaenid butterfly whose caterpillars live as parasites inside colonies of Myrmica ants, feeding on regurgitations from the nurse ants, complete development within one year. The rest are inactive and mature after two years. Intense competition and years where the ant colony avoids reinfection may be part of the explanation.

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