What do mayflies have in common with passenger pigeons?

Visiting a lake in May or June in much of the Midwest likely will bring you into contact with mayflies, although they also occur throughout the country.
We sometimes see huge swarms in spring or early summer, and occasionally they show up on radar. It’s common to find them attached to buildings or trees next to lakes following a hatch. I found a bunch of mayflies attached to my place at Minnesota’s Leech Lake in late June.

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