A monarch butterfly lands on the head of an unsuspecting photographer in the Monarch Butterfly Biosphere Reserve in Mexico's Michoacan state, March 21, 2014.
A monarch butterfly lands on the head of an unsuspecting photographer in the Monarch Butterfly Biosphere Reserve in Mexico's Michoacan state, March 21, 2014. MCT
A monarch butterfly lands on the head of an unsuspecting photographer in the Monarch Butterfly Biosphere Reserve in Mexico's Michoacan state, March 21, 2014. MCT

World

March 31, 2014 1:00 PM

The butterfly effect: Do monarchs’ woes signal broader problems?

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