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Monarch butterfly migration.

Description
(a) Many monarch butterflies east of the Rocky Mountains migrate to a small area in Mexico to avoid the cold northern weather. Here they roost together in large numbers in fir trees. Some butterflies may stay in Florida and Cuba. Butterflies west of the Rockies overwinter in mild coastal California locations. (b) Aggregation of monarch butterflies in their overwintering site in Mexico.
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9 years ago
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