Celebrating 50 Years of Monarch Butterfly Migration to Mexico

Every autumn, millions of monarch butterflies migrate to Michoacán, Mexico, to escape the cold. This year marks the 50th anniversary of the discovery of their hibernation sites by naturalists Catalina Aguado and Kenneth Brugger. Their journey, which began in 1975, revealed the butterflies' unique migration patterns and hibernation habits, crucial for their survival. The butterflies gather in the El Rosario sanctuary, where optimal conditions allow them to thrive from November to March. This migration not only holds ecological significance but also cultural importance, coinciding with Mexico's Day of the Dead celebrations, as the Purépecha people viewed the butterflies as the souls of the departed.

Key Details: • The monarchs migrate from the northeastern U.S. and southeastern Canada, covering 1,900 to 4,500 kilometers. • El Rosario sanctuary is a UNESCO World Heritage site, covering 56,259 hectares. • The butterflies hibernate from November to March, adapting their metabolism during this period. • The arrival of monarchs coincides with the Day of the Dead on November 1 and 2.