05-06-2014 01:56 AM | USA

Monarch butterflies threatened by GM crops in U.S., study says

A sweeping Canadian-led study of environmental influences on monarch butterflies has thrown into sharp focus what appears to be the most crucial factor affecting the migrating insect’s survival: loss of milkweed in the U.S. Midwest due to a change in farming practices.

Monarchs lay their eggs on milkweed plants every spring and summer as successive generations migrate northward from Mexico as far as Canada. At the end of the breeding season a single “super generation” heads back south, travelling thousands of kilometres so that the cycle can begin anew.
Full Story : The Globe and Mail