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10 . Monarch Butterflies Listed as Endangered
The monarch butterfly, known for its legendary migration from Mexico to Canada, is now at great risk of extinction. According to the International Union for Conservation of Nature, the population of this orange-and-black insect has shrunk between 23% and 72% over the past 10 years. IUCN has labeled it as being endangered after having added it to its Red List of Threatened Species.
Another factor at play is the use of herbicides (除草剂) in agricultural fields.
Climate change has also taken a heavy toll on the species.
Monarch experts are calling for the public’s help in the fight to save the species. “Few species inspire the awe and wonder that the migratory monarch butterfly commands,” said Dr. Sean T. O’Brien, President and CEO of Nature Serve. “While efforts to protect this species are encouraging, much is still needed to ensure its long-term survival.”
What can be done to case the problem? A middle-of-the-road solution is gaining ground. Scientists recommend promoting the growth of native milkweed and nectar flowers. Monarch butterflies are a common backyard insect in America, so everyone can contribute their share. —
A.People can plant milkweed to support their egg-laying and caterpillars. |
B.When they are caterpillars (幼虫), monarchs entirely depend on milkweed. |
C.Hence, local people should maintain thick forests and reduce the use of pesticides within the monarch’s range. |
D.The reasons for the threat to monarchs are varied, but the leading one is the decades-long destruction of its habitats. |
E.In a one-two punch, droughts have limited the growth of milkweed, thus threatening the butterflies’ overwintering habitats. |
F.To help ensure the survival of monarchs, the habitats of the Monarch butterfly need to be protected and conserved. |