The increased use of herbicides to kill weeds both on farm crops and along roads has reduced the amount of Milkweed available for the butterflies to lay their eggs on.
via LiveScience.com http://www.livescience.com/28722-migrating-monarch-butterflies-migration-hazards.html
via LiveScience.com http://www.livescience.com/28722-migrating-monarch-butterflies-migration-hazards.html
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