Monarch butterflies drop, migration may disappear

[T]he displacement of the milkweed the species feeds on by genetically modified crops and urban sprawl in the United States, extreme weather trends and the dramatic reduction of the butterflies’ habitat in Mexico due to illegal logging of the trees they depend...

Monarch Butterfly 2013 Migration Smallest on Record

[T]he primary food source for monarch larvae that emerge in the United States and Canada is disappearing. The common milkweed, Asclepias syriaca, is being wiped out by the glyphosate herbicides used on genetically modified crops. Monarch Butterfly 2013 Migration...