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FILE - In this Nov. 12, 2015 file photo, an ailing butterfly rests on a plant at the monarch butterfly reserve in Piedra Herrada, Mexico State, Mexico. Millions of monarchs migrate from the United States and Canada each year to pine and fir forests to the west of the Mexican capital. (AP Photo/Rebecca Blackwell, File)

FILE - In this Nov. 12, 2015 file photo, an ailing butterfly rests on a plant at the monarch butterfly reserve in Piedra Herrada, Mexico State, Mexico. Millions of monarchs migrate from the United States and Canada each year to pine and fir forests to the west of the Mexican capital. (AP Photo/Rebecca Blackwell, File)

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