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How Do Monarchs Know the Way to Mexico? Every fall, we watch monarchs migrate down the map toward their winter home. The monarchs travel to a place they've never been before! How do they know which way to go? How do they know when they get there? "The means by which monarchs navigate has mystified monarch researchers for over half a century and it remains one of the most intriguing questions of monarch biology," says monarch scientist Dr. Bill Calvert.