Monarch butterfly population in Mexico was up by more than a third last year, compared to 2020
From a distance, they appear like autumn foliage: millions of endangered monarch butterflies blanketing trees in a kaleidoscope of brown, orange and black.
Every year, migratory monarchs travel up to 3,000 km from the eastern United States and Canada to spend the winter among the forests of central and western Mexico. Sierra Chincua in 1986 was brought into the protected Monarch Butterfly Biosphere Reserve, which is now a UNESCO World Heritage Site spanning some 138,000 acres .
Last year’s migration, however, offered a glimmer of hope for the monarch’s future. Their presence in Mexico was actually up by more than a third compared to 2020.
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