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FILE - In this Dec. 9, 2011 file photo, a Monarch butterfly perches on a tree at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state. The number of Monarch butterflies wintering in Mexico has plunged to its lowest level since studies began in 1993. A report released on Wednesday, 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/Marco Ugarte, File)

FILE - In this Dec. 9, 2011 file photo, a Monarch butterfly perches on a tree at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state. The number of Monarch butterflies wintering in Mexico has plunged to its lowest level since studies began in 1993. A report released on Wednesday, 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/Marco Ugarte, File)

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