By Mila Dorsey, age 10
Monarch butterflies are now endangered, says the International Union for Conservation of Nature. Scientists predict that monarch butterfly populations have decreased by between 20 to 90% in the last few decades.
Each fall, thousands of monarch butterflies travel from their summer homes in the northern U.S. and Canada to their winter homes in California and Mexico. But when scientists did the annual Western Monarch Thanksgiving Count in November 2018, they found that the number of West Coast monarchs in California dropped by 86 percent since 2017. …
In 2004, there were approximately 500 million monarchs that made the migration to Mexico. Last year, that number was 60 million. This year, it was only 33 million.