Dec. 24, 2013
Monarch butterflies flutter around the globe
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Photo: Joel Achenbach/Washington Post/Getty Images
After the larvae stage, caterpillars create a cocoon from which they emerge as monarch butterflies, looking like this one in Assateague Island, Md.
Read more: Fewer monarch butterflies are becoming 'snowbirds'
In Photos: Fewer monarch butterflies are becoming 'snowbirds'