Monarch Butterfly Survey Report 2023-2024

Every year WWF-Mexico and its partners including The National Commission of Protected Natural Areas in Mexico and the WWF-TELMEX Telcel Foundation Alliance, monitor the sites where the eastern monarch butterfly spends the winter, inside and outside the Monarch Butterfly Biosphere Reserve in Mexico. This analysis is considered a benchmark for the overall abundance of the species. The new data indicates that the species occupied only 2.2 acres during the 2023-2024 winter season, 59% less than the previous year when scientists observed 5.5 acres.