Millions of monarchs inhabit butterfly country

In this photo taken Feb. 15, 2013, Monarch butterflies are collected in a net to be tested for the ophroyocystis elektroscirrha parasite that inhibits their flight, at El Capulin reserve, near Zitacuaro, Mexico. 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)

In this photo taken Feb. 15, 2013, Monarch butterflies are collected in a net to be tested for the ophroyocystis elektroscirrha parasite that inhibits their flight, at El Capulin reserve, near Zitacuaro, Mexico. 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)