Why Scientists Are Performing Brain Surgery on Monarchs

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<img src="https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-jumbo.jpg?auto=webp&quality=75" data-testid="betamax-poster" sizes="(width < 740px) 95vw, 500px" srcset="https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-master180.jpg?auto=webp&quality=75 180w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-blog225.jpg?auto=webp&quality=75 225w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-master315.jpg?auto=webp&quality=75 315w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-popup.jpg?auto=webp&quality=75 334w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-slide.jpg?auto=webp&quality=75 334w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-tmagSF.jpg?auto=webp&quality=75 362w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-blog427.jpg?auto=webp&quality=75 427w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-blog480.jpg?auto=webp&quality=75 480w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-master495.jpg?auto=webp&quality=75 495w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-blog533.jpg?auto=webp&quality=75 533w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-tmagArticle.jpg?auto=webp&quality=75 592w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-articleLarge.jpg?auto=webp&quality=75 600w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-master675.jpg?auto=webp&quality=75 675w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-jumbo.jpg?auto=webp&quality=75 683w, https://static01.nyt.com/images/2025/12/08/science/earth/Monarch_Thumb/Monarch_Thumb-superJumbo.jpg?auto=webp&quality=75 735w" fetchpriority="high" class="_poster_13tnt_20"/> Scientists in Texas are finding out monarch butterflies to grasp how they navigate hundreds of miles, probably by sensing Earth’s magnetic discipline. Alexa Robles-Gil explains how researchers are analyzing the butterflies’ brains to search out solutions. By Alexa Robles-Gil, Leila Medina, Joey Sendaydiego and Mark Felix

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