Many insects migrate, sometimes for thousands of kilometres. The monarch butterfly migrates from North America to Mexico in the winter, a distance of 3,200 km. Here they spend the winter in a state of semi-hibernation. Incredibly, most of the butterflies die during the journey, and the grandchildren of the original butterflies arrive back exactly where their grandparents hatched. Sometimes it takes three or four generations before the migration is completed. In spring, the butterflies begin the journey north again.
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