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Monarch butterflies are beloved—and declining for this sad reason | Popular Science
Scientists trawled thousands of volunteer surveys over 25 years to understand what imperils the insects. By Kate Baggaley | Updated Jul 21, 2021 12:00 PM For the past three decades, monarch butterflies have been dwindling. The iconic bugs face a number of threats in North America, from weed killers to climate change, but it hasn’t…
