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How Many Monarchs This Winter?
Estimating the Size of the Monarch Population in Mexico
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The Annual Cycle of the Monarch Butterfly


Every year monarch butterflies migrate to Mexico from across eastern North America. They cluster by the millions in 12 mountain sanctuaries. Because the butterflies are gathered in one small region of Mexico, scientists have a chance to estimate the size of the entire migratory population once each year. This slideshow explores the question:

Essential Question
Why is it important to collect and analyze monarch population data from year to year?


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