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Do monarchs’ woes signal broader problems?

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ANGANGUEO, Mexico — On a high mountain slope in central Mexico, a patch of fir trees looks dusted in orange and black. In fact, millions of monarch butterflies cloak the trees. The forest murmurs with the whir of their flapping wings.

Every year, hundreds of millions of monarch butterflies — each so light that 50 together weigh barely an ounce — find their way on what may be the world’s longest insect migration, traveling the length of North America to…

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