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

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

March 31, 2014 1:00 PM