In this November 12, 2015 file photo, a guide holds up a damaged and dying butterfly at the monarch butterfly reserve in Piedra Herrada, Mexico. The number of monarch butterflies wintering in Mexico dropped by 27 percent this year, reversing last year’s recovery from historically low numbers, according to a study by government and independent experts released Thursday, February 9, 2017. (Photo by Rebecca Blackwell/AP Photo)
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