What drives the monarch butterfly's 2,000-mile sojourn?

October 2, 2014 8:13 PM

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What drives the monarch butterfly's 2,000-mile sojourn?

Genetic analysis of 101 monarch butterflies has upended existing theories about the evolution of the iconic orange-and-black butterflies.

It’s a story nearly every grade-schooler knows: Every year, millions of monarch butterflies emerge from their chrysalises in the northern United States and southern Canada. By the time the leaves start to change color in the fall, they take to the skies in clouds of fluttering orange and black and e...

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