Radar picks up Monarch butterflies migrating through St. Louis

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ST. LOUIS, MO (KTVI) - The confluence of the Missouri and Mississippi Rivers is the heart of a major migration route for birds and insects.  The National Weather service shared these photos to their Facebook page.  Radar often captures migrating birds and insects in the Spring and Fall. The radar returns, those blue and green areas, are believed to be Monarch butterflies making their way south for the winter.  This image is from last Friday, a sunny, dry day, when the radar picture would typically be clear.

The NWS St. Louis writes in the post, "A Monarch in flight would look oblate to the radar, and flapping wings would account for the changing shape! NWS St. Louis wishes good luck and a safe journey to these amazing little creatures on their long journey south!"

The Audubon Center at Riverlands tracks many of the bird migrations in the area.  They say that millions of birds travel through the area.

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Those migrations can be seen on radar.

Want the latest updates?  Check the latest regional migration forecast here.