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Millions of eastern North American monarch butterflies migrate in winter to the mountainous Sierra Chincua butterfly sanctuary in Mexico.
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Monarch butterflies lay on the ground at the Sierra Chincua butterfly haven on a mountain in Angangeo, Michoacan, Mexico November 24, 2016. REUTERS/Carlos Jasso
Monarch butterflies fly at the Sierra Chincua butterfly asylum. Sierra Chincua is an UNESCO World Heritage Site, one of 14 provinces in these mountains, which together record for the greater part of the eastern North American ruler populace. It is evaluated up to a billion butterflies winter in this district in any given year. REUTERS/Carlos Jasso
A ruler butterfly lays on the ground at the Sierra Chincua butterfly asylum. REUTERS/Carlos Jasso
Monarch butterflies lay on the ground at the Sierra Chincua butterfly asylum. REUTERS/Carlos Jasso
A ruler butterfly lays on a tree at the Sierra Chincua butterfly asylum. REUTERS/Carlos Jasso
Monarch butterflies fly almost a tree at the Sierra Chincua butterfly asylum. REUTERS/Carlos Jasso
A ruler butterfly lays on the ground at the Sierra Chincua butterfly asylum. REUTERS/Carlos Jasso
Monarch butterflies lay on a tree at the Sierra Chincua butterfly haven. REUTERS/Carlos Jasso