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. (AP Photo/Marjorie Miller)
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. (AP Photo/Marjorie Miller)