Monarchs have declined by 80 % over the last 20 years. Monsanto's GMO crops and Roundup pesticides have removed the milkweed plants that monarchs eat. "In addition to glyphosate, monarchs are threatened by other herbicides including dicamba, Enlist Duo and by neonicotinoid insecticides that are toxic to young caterpillars." https://www.ecowatch.com/monarch-butterfly-population-migration-2543505935.html