'No one knows why the monarchs travel so far'

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Travel Trip Monarch Butterflies
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Travel Trip Monarch Butterflies
In this photo taken Feb. 16, 2013, University of Georgia scientist Sonia Altizer looks for signs of the ophroyocystis elektroscirrha parasite in the residue of Monarch butterflies, which attaches to the Monarchs inhibiting their flight, at El Capulin reserve, near Zitacuaro, Mexico. Every year, millions of monarchs migrate from the eastern United States and Canada to central Mexico, a journey of over 2,000 miles. The tiger-striped butterflies arrive in late October and early November to hibernate in fir trees until February. Altizer leads the research project conducted by the World Wildlife Fund of Mexico and the University of Georgia and University of Minnesota. (AP Photo/Marjorie Miller)