Huge Swarm of Mayflies Shows Up On Weather Radar

July 24, 2014 at 12:40 PM Leave a comment

This is amazing:

Weather radar out of La Crosse, Wisconsin, July 20, 2014:

Once a year, the bugs emerge — millions of them. Every summer, they swarm en masse around the banks of the Mississippi River. It’s mating season for mayflies.

There are so many of them, in fact, that they can show up on weather radar.


Though they live underwater for a few years, depending on the species, they only last a week or so after leaving the water — just enough time to breed.

Mayflies via

(Image via

To read more and to watch the GIF, go here.

Entry filed under: Animals (Other Than Us).

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