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Climate change, herbicide may doom 'great migration' of monarch butterflies

Every year, between November and March, oyamel, oak and pine forests on the mountainous border of Michoacán and Mexico state house most of the monarch butterflies that migrate from the United States and Canada by flying south to Mexico for the winter. But over the past couple of years, the number of monarch butterflies that reach Mexican sanctuaries has been declining, generating concern among rural communities that rely on spillovers of butterfly tourism activities.

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