Monarch Butterfly Biosphere Reserve, Mexico

MONARCH BUTTERFLY BIOSPHERE RESERVE (Mexico)

Every year in late-summer or autumn, monarch butterflies make a north-to-south migration. Hundreds of millions of these fly thousands of miles to overwinter in the Monarch Butterfly Biosphere Reserve on the border of Michoacán and the State of Mexico, 60 miles NW of Mexico City. They breed along the way: no single individual makes the entire trip.

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(Image courtesy Wikimedia Commons; CTTO)