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Millions of butterflies begin annual migration to Mexico
Reuters
As Monarch butterflies migrate to Mexico's forested mountains in Michoacan, biologists fear droughts in the U.S. and Mexico will affect their numbers.
00:01:33 23/11/11 at 04:47 Views 37 0 VotesDescription:
As Monarch butterflies migrate to Mexico's forested mountains in Michoacan, biologists fear droughts in the U.S. and Mexico will affect their numbers.