Monarch Butterflies mass packed in tightly for warmth on a tree in the forests of the El Capulin Monarch Butterfly Biosphere Reserve in Macheros, Mexico. Each year millions of Monarch butterflies mass migrate from the and Canada to the Oyamel fir forests in central Mexico.


Monarch Butterflies mass packed in tightly for warmth on a tree in the forests of the El Capulin Monarch Butterfly Biosphere Reserve in Macheros, Mexico. Each year millions of Monarch butterflies mass migrate from the and Canada to the Oyamel fir forests in central Mexico.


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Photo credit: © Planetpix / Alamy / Afripics
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