Monarch butterfly population plummets 86% in one year in

There were 4.5 million of them in the 1980s. Now there may be fewer than 30,000.

Monarch populations in the US west are down 86% this year

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Alarming decline: Monarch butterfly population in California plummets by 86%

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California Monarch Butterfly Population Down 86 Percent in One Year

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Monarch Butterfly Population Drops by Nearly One-third