The migration of monarchs is one of the last of the earth’s greatest migrations. The monarchs that migrate each fall have never made the journey before, and yet they find their way to the same forests that their ancestors traveled to several generations ago. It’s hard to imagine the challenges they face along the way, and how they make this journey. These tiny insects symbolize resilience: they weigh only half a gram and travel across an entire continent – covering thousands of miles - in a matter of weeks. 'Every fall, millions of monarchs in eastern North America head out on an epic journey that takes them from meadows and prairies of Canada and the US, all the way to winter sanctuaries in the mountains of Mexico.