Environmentalists see more Monarch butterflies in Mexico, but worry about forecast for cold

December 30, 2014 6:30 PM

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Environmentalists see more Monarch butterflies in Mexico, but worry about forecast for cold

In this Dec. 21, 2014 photo, a monarch butterfly perches on a branch in the Piedra Herrada sanctuary near Valle de Bravo, Mexico. More butterflies appear to have made the long flight from the U.S. and Canada to their winter nesting ground in western Mexico, raising hopes after their number dropped to a record low last year. The insects are being hurt by various factors: in Mexico, the encroachment of logging into their habitat; and in the United States, the decline of milkweed, the butterflies’ main source of food that has been crowded out by pesticide-resistant crops. (AP Photo/Christian Palma) (The Associated Press)

In this Dec. 21, 2014 photo, monarch butterflies bunch together on a tree in the Piedra Herrada sanctuary near the Valle de Bravo, Mexico. More butterflies appear to have made the long flight from the U.S. and Canada to their winter nesting ground in western Mexico, raising hopes after their number ...

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