Watch Again

America's Mississippi:

This Swarm of Mayflies is Big Enough to Fool Weather Satellites

Watch More
back to video

»The Headwaters

This Swarm of Mayflies is Big Enough to Fool Weather Satellites

Short | 03:04

After two years of incubation, a swarm of mayflies rise from the bottom of the Mississippi River, like a biblical plague. They'll live for just one day.

More About This episode

The Mississippi River begins as a stream from Lake Itasca in Minnesota before gathering in size and power on its 2,300-mile journey south. Follow the first leg of its path, from the Upper Mississippi watershed to Minneapolis skyscrapers to the western Wisconsin border. Discover the wildlife that depends on the river to survive, from raccoons gearing up for the winter to black bears awaking at the first hints of spring to the massive swarm of mayflies that live a lifetime in a summer day.

Ways to Watch

Buy this show from any of these distributors

Have Smithsonian Channel through your TV provider?

Watch this episode online now.

Return to Video Page