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The original was posted on /r/science by /u/-Mystica- on 2025-08-01 12:08:57+00:00.

Original Title: Monarch butterflies’ mass die off in 2024 caused by pesticide exposure – study. As much as 90% of the monarch butterfly population in some US regions has been wiped out in recent decades, and evidence has pointed to pesticides, climate crisis and habitat loss as the drivers.