CBS News
Monarchs traveled to a remote part of Mexico, a journey they’ve made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north…
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Inside the monarch butterfly migration mystery: flying to Mexico from Canada, the U.S.
Yuri Kucera
01:31
Monarchs traveled to a remote part of Mexico, a journey they’ve made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north…