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Thoroughly Modern Migrants

Moths and butterflies—round-trip tickets not necessary

Hugh Dingle is gracious about geese and robins. They may be the most popular icons of migration, winging south in the fall and lifting people's spirits in spring, when they finally honk or bob-bob-bob their way back to the same territory. For decades, a bird-based idea of migration dominated popular and scientific thinking: Individual animals went somewhere each year, then came back.

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