Monarch Cluster LB
During the winter months, monarch butterflies roost in high-altitude fir forests in central Mexico by the hundreds of millions. By Lincoln Brower
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- Lincoln Brower surveys a forest site where monarchs winter in the Sierra Chincua Butterfly Sanctuary in 2010. Credit: ©Medford Taylor
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- During the winter months, monarch butterflies roost in high-altitude fir forests in central Mexico by the hundreds of millions. By Lincoln Brower
