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Opler and Krizek discuss this difficult question in Butterflies East of the Great Plains, where they state that the expected life span, which is usually much shorter than the maximum life span (because of weather, predators, and many other factors), ranges from about 2 to 14 days. Maximum life span ranges from about 4 days for the Spring Azure to 10 to 11 months for the Mourning Cloak. Just as with people, females generally live longer than males. Butterflies which hibernate or go into reproductive diapause also tend to live longer.

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