A Monarch butterfly perches on a tree at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state in 2011.
A Monarch butterfly perches on a tree at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state in 2011. AP
A Monarch butterfly perches on a tree at the Sierra Chincua Sanctuary in the mountains of Mexico's Michoacan state in 2011. AP

As monarch butterflies disappear, it raises alarms and a call to plant milkweed

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