03/17/2026
The eastern monarch butterfly population overwintering in Mexico’s oyamel fir forests occupied 2.93 hectares during the 2025-2026 overwintering season, according to the latest survey released by the World Wildlife Fund–Telmex Telcel Foundation Alliance (WWF) and Mexico’s National Commission of Protected Natural Areas (CONANP). This represents about a 64% increase compared to last year’s estimate of 1.79 hectares.
The eastern monarch butterfly population overwintering in Mexico’s oyamel fir forests occupied 2.93 hectares (7.24 acres) during the 2025-2026 overwintering season, according to the latest survey released by Mexico’s National Commission of Protected Natural Areas (CONANP) and WWF México.
This represents about a 64% increase compared to last year’s estimate of 1.79 hectares.
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