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"There used to be rivers of butterflies, but now there are years when there are no butterflies at all," : "Hardier genetically altered corn and soybean crops in the United States and Canada, in the breadbasket areas that are the monarch's main summer conjugal grounds, have enabled farmers to use stronger herbicides to eliminate weeds. That has drastically depleted the supply of flowers on which the butterflies feed, as well as common milkweed, on which the monarch lays its eggs in the spring and summer and on which its larvae feed, several biologists say. "