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02/01/1974 Discovery of the overwintering place with Monarch butterfly

Each year, millions of monarch butterflies from eastern North America migrate to overwinter located in the Oyamel forests of central Mexico. The Bruggers found two nearly equal concentrations a few miles apart. The location hosted what seemed to be a Monarch butterfly superhighway and fir trees laden with millions of the roosting creatures.


  • Essentials 

  • Monarch butterfly migration 

  • Historical accounts 

  • Migrations 

  • Population and migratory study methods 

  • Conservation 

  • Politics