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Western U.S. monarch butterfly numbers plummet to under 2,000, threatening extinction due to habitat loss, climate change, and pesticides.
Monarch butterfly populations in the western U.S. have declined sharply, with recent counts showing fewer than 2,000 butterflies in their overwintering sites—down from tens of thousands in past decades.
Scientists attribute the drop to habitat loss, climate change, and pesticide use, warning that the species faces extinction without urgent conservation efforts.
The decline signals broader ecological distress and underscores the need for stronger environmental protections.
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El número de mariposas monarca en el oeste de los Estados Unidos se desploma a menos de 2.000, amenazando con la extinción debido a la pérdida de hábitat, el cambio climático y los pesticidas.