Every fall a “super” generation of monarch butterflies leaves Canada to renew an ancient, 4,000-kilometre migration to the Mexican oyamel fir forests. Like many Canadian “snowbirds,” monarch butterflies—now considered an…
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Every fall a “super” generation of monarch butterflies leaves Canada to renew an ancient, 4,000-kilometre migration to the Mexican oyamel fir forests. Like many Canadian “snowbirds,” monarch butterflies—now considered an…