Scientists used tiny new sensors to follow the insects on journeys that take thousands of miles to their winter colonies in Mexico.A monarch butterfly carrying a tiny tag developed by Cellular Tracking Technologies at the Cape May Point Arts and Science Center in New Jersey, which helped fund a monarch tagging project.Credit...Video by Hannah BeierFor the first time, scientists are tracking the migration of monarch butterflies across much of North America, actively monitoring individual insects on journeys from as far away as Ontario all the way to their overwintering colonies in central Mexico.This long-sought achievement could provide crucial insights into...