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Mexico, US, Canada to work on Monarch butterflies
FILE - In this Dec. 9, 2011 file photo a Monarch butterfly sits on a tree trunk at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state. A new study of the Monarch butterflies' winter nesting grounds in central Mexico shows that small-scale logging is more extensive than previously thought, and may be contributing to the threats facing the Monarch's singular migration pattern, according to a new study co-authored by Omar Vidal, the head of Mexico's chapter of the World Wildlife Fund. (AP Photo/Marco Ugarte, File)

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