"They invaded by the trillions.” At nearby Catawba Island, social media posts show clouds of mayflies in the air and the dead ones covering cars, streets and just about everything else.

A team of researchers visited Mae Chaem River in December as part of an “extensive” region-wide wildlife survey with a very specific goal: find some mayflies, Sedtawut Kwanboon and Boonsatien ...

Dr. Hintz says mayflies live, at most, 72 hours. Many of them end up dead in piles and that means it takes some creativity to clean up. "Get your brooms, get your shovels, get your vacuums out ...