Millions of monarch butterflies descend upon Mexico for winter migration

Millions of monarch butterflies have descended upon their sanctuary in the central Mexican state of Michoacán — an annual spectacle that draws tourists, scientists and locals alike.

The monarch butterflies flee the cold winters of Canada and the northern United States, traveling thousands of kilometres to hibernate and reproduce in the temperate woods of central Mexico.

Hundreds of trees crowded with butterflies can be seen along Mexico's 13,000-hectare monarch reserve after the 2,000-mile journey, however, experts warn of a drop in monarch numbers.

According to conservationist group World Wildlife Fund (WWF), the butterflies occupied only 2.1 hectares in December 2020, compared with 2.8 hectares the previous winter season. Climate change is reported to have had an impact on the butterflies' migration pattern.

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