A monarch butterfly perches on a branch in the Piedra Herrada sanctuary near Valle de Bravo, Mexico, last week.
A monarch butterfly perches on a branch in the Piedra Herrada sanctuary near Valle de Bravo, Mexico, last week. Christian Palma AP
A monarch butterfly perches on a branch in the Piedra Herrada sanctuary near Valle de Bravo, Mexico, last week. Christian Palma AP

More Monarch butterflies return to Mexico

December 30, 2014 7:29 PM

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