Monarch Butterfly
The great migration is underway.
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Photo By: Rick L.Hansen / USFWS
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This Monarch butterfly was photographed on aster flower in the John Heinz National Wildlife Refuge in Philadelphia, Pa.
Monarchs are in the midst of their annual migration south. It's one of the wonders of nature. Butterflies from across North America winter in a small area of Mexico, and their annual migration involves multiple generations.
To help scientists understand this phenomenon, you can join MonarchWatch, a citizen science project.
> Related: 25 Fun Citizen Science Projects
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