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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.
Monarch butterfly migration is the phenomenon, mainly across North America, where the subspecies Danaus plexippus plexippus migrates each autumn to overwintering sites on the West Coast of California or mountainous sites in Central Mexico. Other populations from around the world perform minor migrations or none at all.
The best-known lepidopteran migration is that of the eastern population of the monarch butterfly which migrates from southern Canada to wintering sites in central Mexico. In late winter/early spring, the adult monarchs leave the Transvolcanic mountain range in Mexico for a more northern climate.
Monarch butterflies, with their striking black-and-orange coloring, have made a partial recovery in numbers of butterflies migrating from the U.S. and Canada to Mexico this year, after historic ...
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, blaming heat, drought ...
Discovering wintering site of monarch butterflies Catalina Trail (née Aguado , previously known as Cathy Brugger ) is a Mexican-born naturalist and social worker. She is noted for discovering, with her then-husband Kenneth C. Brugger , the location of the overwintering sites of the monarch butterfly , Danaus plexippus .
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.
[14] monarch butterflies can be found in the area as well, as they pass through to their wintering grounds on the State of Mexico-Michoacán border. [15] There have been plagues in the forests of the area due to the recent drought conditions. The most serious is a bark beetle (Dendroctonus adjunctus) and mistletoe (Arceuthobium sp.).