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Associated Press
FILE - In this Jan. 4, 2015 file photo, a kaleidoscope of Monarch butterflies cling to tree branches, in the Piedra Herrada sanctuary, near Valle de Bravo, Mexico. The number of Monarch butterflies that reached wintering grounds in Mexico has rebounded 69 percent from last year’s lowest-on-record levels, but their numbers remain very low, according to a formal census by Mexican environmental authorities and scientists released Tuesday, Jan. 27, 2015. (AP Photo/Rebecca Blackwell, File)

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