new video loaded: Why Scientists Are Performing Brain Surgery on Monarchs
Scientists in Texas are studying monarch butterflies to understand how they navigate thousands of miles, possibly by sensing Earth’s magnetic field. Alexa Robles-Gil explains how researchers are examining the butterflies’ brains to find answers.
By Alexa Robles-Gil, Leila Medina, Joey Sendaydiego and Mark Felix
December 23, 2025