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Photos: Scientists trace a butterfly migration route that is millions of years old

Scientists have recently mapped the painted lady butterfly's annual flight from equatorial Africa to northern Europe and back, the world's longest butterfly migration. In Constant Bloom, photographer Lucas Foglia documents the journey.
Raluca collects butterflies for the Worldwide Painted Lady Migration Project. As drought scorches Europe, painted lady butterflies find blooming flowers in the moist air near melting glaciers in Switzerland.

Scientists have recently mapped the painted lady butterfly's annual flight from equatorial Africa to northern Europe and back, the world's longest butterfly migration. In Constant Bloom, photographer Lucas Foglia documents the journey.

(Image credit: Lucas Foglia)

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