De una extensión de 56.259 hectáreas, esta reserva de biosfera se sitúa en medio de montañas con mucha vegetación a unos 100 km al noroeste de Ciudad de México. Las montañas de esta reserva de biosfera albergan una variedad de microclimas y numerosas especies endémicas de flora y fauna. Cada otoño, millones o quizá un billón de mariposas monarcas procedentes de extensas áreas de América del Norte anidan en pequeñas zonas del bosque de esta reserva, tiñendo sus árboles de color naranja. Literalmente, el peso de tantas mariposas llega incluso a plegar las ramas. En la primavera boreal estas mariposas comienzan una migración de ocho meses hacia toda la parte oriental del Canadá. Durante un período de cuatro generaciones consecutivas nacen y mueren. Aún se ignora cómo logran encontrar su camino hasta el lugar de hibernación.

Valor universal excepcional en inglés

Values The Monarch Butterfly Biosphere Reserve World Heritage property protects key overwintering sites for the monarch butterfly. The overwintering concentration of butterflies in the property is a superlative natural phenomenon. The millions of monarch butterflies that return to the property every year bend tree branches by their weight, fill the sky when they take flight, and make a sound like light rain with the beating of their wings. Witnessing this unique phenomenon is an exceptional experience of nature. Criterion (vii): The overwintering concentration of the monarch butterfly in the property is the most dramatic manifestation of the phenomenon of insect migration. Up to a billion monarch butterflies return annually, from breeding areas as far away as Canada, to land in close-packed clusters within 14 overwintering colonies in the oyamel fir forests of central Mexico. The property protects 8 of these colonies and an estimated 70% of the total overwintering population of the monarch butterfly’s eastern population. Integrity The property includes more than half of the overwintering colonies of the monarch butterfly’s eastern population. They provide a good sample of the areas that are essential for maintaining this superlative natural phenomenon. The maintenance of the standing forest and the microclimates that they create is the key management requirement, thus any threat to the forests is of utmost concern. Illegal logging is a known threat to the property with potential direct impacts on its Outstanding Universal Value. Public use has been increasing and the levels of visitation and infrastructure provided require careful control both in relation to impacts on the ecosystem and the quality of experience provided by the property to visitors. Due to its migratory nature, the maintenance of the overwintering phenomenon also requires attention to the conservation of the monarch butterfly by those countries through which it travels during its life cycle. Requirements for Protection and Management The principal focus of protection and management should be to prevent illegal logging in the property. Priorities to achieve this include concerted planning and action between all relevant federal, state and local agencies, and work with local communities on environmental protection and the provision of alternative livelihoods to logging. As the overwintering phenomenon is a significant attractor to visitors, management also needs to be directed to achieving sustainable public use of the property. This should respect the quality of the visitor experience and promote benefit-sharing mechanisms for local communities as an incentive to enhance their support to the conservation of the property. Continued investment in coordinated continent-wide management of the migratory phenomenon is a further important dimension of site management. Achieving all of these priorities requires the provision of adequate and sustained institutional and financial support.