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Last updated on April 20, 2014 at 5:20 EDT
ButterflyMilkweed Co-evolutionary Relationship
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Butterfly/Milkweed Co-evolutionary Relationship

June 27, 2012
This illustration shows the co-evolutionary relationship between the monarch butterfly and the milkweed plant. It also shows the migration of the butterflies and the seeds replanted by the milkweed pods. (Date of Image: October 2008) Credit: C. Babaian