00:00the last minute of 60 minutes is sponsored by united healthcare coverage you can count on for
00:09your whole life ahead tonight an update on last season's story from the mountains of mexico where
00:18we witness the mysterious migration of monarch butterflies you can actually hear the sound of
00:25butterfly wings yeah let's just be quiet for a second look at that look look at that oh my gosh
00:45it's still something of a mystery how these monarchs find their way thousands of miles from the u.s. to
00:51mexico but now scientists are using tiny solar-powered radio tags to track individual
00:57butterflies unlocking clues about one of the most remarkable migrations in the natural world
01:03i'm anderson cooper we'll be back next week with another edition of 60 minutes
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