Monarch Butterfly Essay examples
ITT Technical Institute
According to National Geographic monarch butterflies travel up to 3,000 miles each fall to their wintering site in central Mexico. In 2004, an estimated 550 million completed the winter migration, while in 2003 only 33 million arrived. Further, between 2012 and 2013, there was a 43.7 percent decrease in the area occupied by the butterflies in the winter sanctuaries, the decline has numerous reasons: climate change, deforestation, and habitat loss, agricultural use of pesticides and herbicides
Monarch butterflies are known for the incredible mass migration that brings millions of them to California and Mexico each …show more content…
The Monarch butterflies go through prolonged stages of metamorphoses, starting with its larva or caterpillar, shedding or molting its skin an amazing five times before the pupa stage, right after they emerge as beautifully colored, black, orange and white adults, the colorful pattern makes monarchs easy to identify, and that distinctive pattern warns predators that the insects are foul tasting and poisonous.
Butterflies that emerge from pupa stage in late summer and early fall are different from those that do so during the longer days and warmer weather of summer. These monarchs are born to fly, and know because of the changing weather that they must prepare for their lengthy journey.
Only monarch born in late summer or early fall makes the migration, and they make only one round trip. By the next year’s winter migration begins, several summer generations will have lived and died and it will be the last year’s migrators’ great grandchildren that make the trip. Somehow these new generations know the way, and fallow the same routs their ancestors took sometimes even returning to the same tree.
According to National Geographic many scientists are concerned about the eastern population of monarchs, which summer east of the Rocky Mountains. This group is