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The letter said, "Plummeting from a high of 1.1 billion monarch butterflies overwintering in central Mexico´s high-altitude oyamel fir forests in 1996 to a pitiful 33 million thinly scattered over seven sites during the current 2013–2014 season, the extraordinary monarch butterfly migratory phenomenon is now officially endangered.
MEXICO CITY (AP) — The number of monarch butterflies at their wintering areas in Mexico dropped by 59% this year to the second lowest level since record keeping began, experts said Wednesday ...
The government commission for natural protected areas said the butterflies’ population covered 2.84 hectares (7 acres) this year, compared to 2.1 hectares (5.2 acres) last year. Monarch ...
Mexican experts say the number of monarch butterflies that arrived to winter in mountaintop forests rose by 35% from last year.
Many are joining the non-profit organization Monarch City USA to commit to increasing monarch habitat in their area. [178] The Monarch Butterfly Biosphere Reserve was established in 1986 to protect overwintering sites in Mexico.
Valle de Bravo also lies in the wintering grounds of the monarch butterfly. Piedra Herrada, located 25 km east of the town on the north side of the Los Saucos highway, is a federal reserve for the protection of the butterflies. In this sanctuary, visitors can rent horses to explore the sanctuary as well as a guide.
The Volcanic Belt pine–oak forests of eastern Michoacán and western México states is the winter habitat of monarch butterflies (Danaus plexippus), which migrate from temperate regions of North America east of the Rocky Mountains. The Mariposa Monarca Biosphere Reserve is within this habitat.
A new report shows a sharp decline in monarch butterflies migrating to Mexico as well as a loss of habitat in the forests they spend their winter each year.