Monarch butterflies drop ominously in Mexico

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Travel Trip Monarch Butterflies
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Travel Trip Monarch Butterflies
In this photo taken Feb. 15, 2013, researchers from the University of Georgia and University of Minnesota select Monarch butterflies to be tested for the ophryocystis elektroscirrha parasite that attaches to the butterflies and inhibits 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. The scientist is part of a research project conducted by the World Wildlife Fund of Mexico and the University of Georgia and University of Minnesota. (AP Photo/Marjorie Miller)