Monarch butterflies mass together on the branches of an Oyamel Fir tree to stay warm on a chilly day in their over-winter site in the Cerro Pelon Monarch Butterfly Preserve near Macheros, Michoacan, Mexico. The monarch butterfly migration is a phenomenon across North America, where the butterflies migrates each autumn to overwintering sites in Central Mexico.

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Size: 9504px × 6336px
Location: Macheros, Michoacan, Mexico
Photo credit: © Richard Ellis / Alamy / Afripics
License: Royalty Free
Model Released: No

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