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Illegal logging has been a major threat to the pine and fir forests where the butterflies gather in clumps to keep warm in the winter.

Mexico cityDistrito federalRocky mountainsCanada generalUnited statesJorge rickardsGloria taveraNational commission of protected natural areasInternational union for conservation of natureMexico commission for national protected areasTelcel allianceNational commissionProtected natural areasInternational unionNational protected areasMonarch butterfly