Migrating monarchs paint butterfly portrait for radar watchers

September 24, 2014 2:26 PM

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National Weather Service radar picked up a giant butterfly-shaped mass flying over St. Louis, Mo. last week. As it turns out, the butterfly portrait was actually formed by a swarm of butterflies.

A mysterious butterfly-shaped cloud spotted over St. Louis last week was built from actual butterflies, the National Weather Service said.

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