What happens to the mayflies when they... ?

University of Toledo professor explains why mayflies are a good thing

Mayflies swarm ODW's Put-in-Bay Aquatic Visitor Center

LOOK: Mayflies swarm Put-in-Bay Aquatic Center

A swarm of mayflies took over an aquatic visitor center in Ohio

Mayflies swarm WKYC Studios

Mayflies take over Festival of the Fish

Grand Lake mayfly hatch!

Ohio ground and building covered by mayflies

WATCH | Mayflies swarm Cleveland's skyline during Matt Wintz's weather forecast

Mayfly mayhem hits Ohio

Mayflies Overtake Ohio Visitor Center

Nightmare Mayfly Swarm Takes Over Ohio Gas Station | Unseen News

Ohio Division of Wildlife says insects indicate good water quality in Lake Erie