A monarch butterfly tag (IMAGE)

Iowa State University

A monarch butterfly tag

Caption

Monarch butterflies carry out a remarkable migration pattern year after year. Monarchs born in Midwestern states move south during the late summer and fall and arrive in central Mexico for the winter. The monarchs then move northward again in the spring. But steep population declines over the last few years have threatened the viability of the migration pattern.

Credit

Iowa State University News Service

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