Just about anyone in the eastern United States will recall from their youth the beautiful black and brown Monarch butterflies that migrate en masse from Mexico to breed and feed here and in Canada, before returning to slumber in a central Mexican forest. But this year their numbers have dropped by 59 percent, according to the latest WWF-led annual census of the insects. In part this has to do with the loss of milkweed that butterflies require for food and to breed, which has declined in parts of the United States where genetically modified soybean and corn crops are grown. But that’s not the only reason, according to the experts.
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