Monarch butterflies clustering on the boughs and the trunks of Oyamel fir trees in the Senguio Colony, located on the Sierra Chincua, 16 February 2009. (Photo L.P. Brower, Sweet Briar College)
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| Monarch butterflies clustering on the boughs and the trunks of Oyamel fir trees in the Senguio Colony, located on the Sierra Chincua, 16 February 2009. (Photo L.P. Brower, Sweet Briar College)
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