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Associated Press
FILE - In this Friday, Oct. 19, 2007 file photo, a monarch butterfly takes flight from a wetland area at Cooks Slough Nature Park in Uvalde, Tex. as they make their yearly journey from summer homes in Canada and northern states to a winter nesting site in central Mexico. The butterflies are famous for migrating from the U.S. and Canada to Mexico for the winter. A study by researcher Marcus Kronforst of the University of Chicago released in the journal Nature on Wednesday, Oct. 1, 2014 suggests the species itself also started out in North America some 2 million years ago, instead of South or Central America. (AP Photo/San Antonio Express-News, Bahram Mark Sobhani)

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