WorldHow your smartphone could help unlock the mystery of the monarch butterfly's migration from MexicoA total of 160 monarchs across Mexico’s six butterfly sanctuaries have been tagged with new transmitters that will provide the most detailed look to date at the first leg of the the insects' migration back north.Butterflies that swarm El Rosario reserve over winter tagged with tiny transmitters to track journey northJorge Barrera · CBC News · Posted: Mar 14, 2026 4:00 AM EDT | Last Updated: 8 hours agoPlayListen to this articleEstimated 6 minutesThe audio version of this article is generated by AI-based technology. Mispronunciations can occur. We are working with our partners to continually review and improve the results.Monarch butterflies swarm in the sunlight at the El Rosario sanctuary in Mexico, where they spend the winter. They're now preparing for their migration back north to the U.S. and southern Canada — a journey that largely remains a mystery.…