The annual migration of millions of monarch butterflies from Canada to Mexico is among nature’s many wonders. Over the past decade, environmental problems have had an impact, but this year, the butterfly numbers are up. Illegal logging in Mexico remains a threat to the butterflies. Local authorities say in 2015, this reserve lost more than 20 acres of forest. To help save the monarch butterflies, conservation efforts in Canada, the United States and Mexico are being stepped up.
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