Monarchs complete a fascinating, annual, multi-generational migration, returning to the same overwintering sites each fall and staying there through the winter until the next breeding season. Despite intensive study, the monarch’s migration mechanisms remain a mystery that captures the imagination. Although flying hundreds to thousands of miles exacts a high physiological cost, migration is an important adaptation that helps to keep monarch populations healthy. By moving to new locations, monarchs can find new patches of milkweed, increasing their offspring’s survival potential.  Migration also helps the butterflies break the parasite- or disease-host cycle.

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• Publication Date January 11, 2023
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