🌿 Environment Aug 1, 2025 · Paige Bennett

Mass Die-Off of Western Monarch Butterflies Linked to Pesticides, Study Finds

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Mass Die-Off of Western Monarch Butterflies Linked to Pesticides, Study Finds
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A new peer-reviewed study has linked pesticides as a likely cause to a mass die-off of Western monarch butterflies that occurred in 2024.



In January 2024, researchers found hundreds of dead or dying monarch butterflies near the Pacific Grove Monarch Sanctuary in California, where Western monarch butterflies typically overwinter.



As The Guardian reported, researchers found the butterflies showing signs of neurotoxic pesticide poisoning, leading to further testing and analysis that has now b

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