Anderson Cooper witnesses monarch butterfly migration's genetic mystery

Each spring, millions of monarch butterflies depart the mountain forests of Mexico on a journey northward that none of them has ever made — guided by something written into their very biology before they were born. Anderson Cooper spent three years pursuing this phenomenon for 60 Minutes, navigating narrow weather windows and 11,000-foot terrain to witness a migration that science has yet to fully explain. It is a story not merely about butterflies, but about the deep intelligence nature encodes in living things — and the humility that comes from watching it unfold.