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FILE - In this March 13, 2005 file photo, Monarch butterflies gather on a tree at the El Rosario Butterfly Sanctuary near Angangueo, Mexico. The number of Monarch butterflies wintering in Mexico has plunged to its lowest level since studies began in 1993. A report released on Jan. 29, 2014 by the World Wildlife Fund, Mexico’s Environment Department and the Natural Protected Areas Commission blames the dramatic decline on the insect’s loss of habitat due to illegal logging in Mexico’s mountaintop forests and the massive displacement of its food source, the milkweed plant. (AP Photo/Kirsten Luce, File)

FILE - In this March 13, 2005 file photo, Monarch butterflies gather on a tree at the El Rosario Butterfly Sanctuary near Angangueo, Mexico. The number of Monarch butterflies wintering in Mexico has plunged to its lowest level since studies began in 1993. A report released on Jan. 29, 2014 by the World Wildlife Fund, Mexico’s Environment Department and the Natural Protected Areas Commission blames the dramatic decline on the insect’s loss of habitat due to illegal logging in Mexico’s mountaintop forests and the massive displacement of its food source, the milkweed plant. (AP Photo/Kirsten Luce, File)

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