VOA慢速英语2021--帝王蝶返回加利福尼亚越冬

（单词翻译）

There is new hope for the future of a population of endangered butterflies in the American state of California. Last year, a count of the orange-and-black Western monarchs² reached a record low of about 1,900.

But this year, butterfly counters are reporting tens of thousands more Western monarchs. The insects live along California's central coast in winter.

The non-profit science group Xerces Society for Invertebrate³ Conservation carries out the official study every year. It just opened the first period of this year's count on November 13. But it says early reports are positive.

Sarina Jepsen is director of Endangered Species at Xerces Society. She says volunteer counters have reported the presence of as many as 50,000 monarchs in the last few weeks.

Jepsen says the finding is "...not a recovery, but we're really optimistic and just really glad that there are monarchs here and that gives us a bit of time to work toward recovery of the Western monarch¹ migration⁴."

In the 1980s, millions of Western monarchs gathered in trees from northern California down to western Mexico. Now, their wintering sites are mostly on California's central coast.

Western monarch butterflies travel south from the Pacific Northwest to California each winter. They return to the same places and even the same trees, where they gather. The monarchs usually arrive in California at the beginning of November. They spread across the country once warmer weather arrives in March.

The Western monarch butterfly population has decreased by more than 99 percent since the 1980s.

Another monarch population on the eastern side of the Rocky Mountains travels from southern Canada and the northeastern United States to spend the winter in western Mexico. Scientists estimate the monarch population in the eastern U.S. has fallen about 80 percent since the mid-1990s.

Monarchs from across the West migrate yearly to about 100 wintering sites along central California's Pacific coast. One of the best-known wintering places is the Monarch Grove⁵ Sanctuary⁶ in the city of Pacific Grove.

Pacific Grove, California, known as "Butterfly Town, USA," has worked for years to help the decreasing monarch population. The city holds a parade to celebrate the butterflies every October. It also bans human interference with the monarchs. The crime carries a $1,000 fine.

Last year, no monarchs appeared in Pacific Grove. But this year, an early count found that more than 13,000 of the insects had moved in.

Scientists do not know why the population increased this year. But Jepsen said it is likely a combination of reasons, including better conditions on their breeding grounds.

Monarch butterflies lack state and federal legal protection that could keep their territory from being destroyed. Last year, the butterflies were denied federal protection. But the insects are now among the candidates for listing under the federal Endangered Species Act.

Words in This Story

optimistic – adj. having or showing hope for the future : expecting good things to happen

glad – adj. feeling pleasure, joy, or delight

breeding – n. the process by which young animals, birds, etc., are produced by their parents