"... Monsanto’s Roundup has been tied to the decrease in the population of monarch butterflies by killing the very plants that the butterflies rely on for habitat and food. What’s been shown to be an even greater threat to the population, though, is Monsanto’s Roundup Ready corn and soybeans ...
A 2011 study published in the journal Insect Conservation and Diversity found that increasing acreage of genetically modified Roundup Ready corn and soybeans is heavily contributing to the decline in monarch butterfly populations within North America. Milkweed, a plant butterflies rely on for habitat and food, is being destroyed by the heavy use of glyphosate-based pesticides and Roundup Ready crops."
https://www.truthout.org/monsantos-r...ons/1331303182