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4-6
Some methods of studying monarch butterfly migrations--such as tagging and measuring resting colonies--show that populations are decreasing, and Hirsch investigates why? A readable narrative, illustrated with excellent photos and infographics, discusses the environmental culprits (deforestation, herbicides, climate change) and how scientists are helping. Kids, too, can help conserve monarch populations with the appended "citizen scientist" suggestions. Reading list. Bib., ind.