Knee-deep in a river of northern Thailand, scientists scooped up some sand with a net and sifted through it. Hidden between ...

Mayflies don't bite and adults only live for a day, but you don't want to get stuck in a swarm. Here's what to know about the mayfly insect.

Scientists scooped sand from a riverbed in Thailand and found two nymphs of rare mayfly species not seen in 22 years, a study said. Photo from Kwanboon and Boonsoong (2025) Knee-deep in a river of ...

The method worked. Researchers found two nymphs of the “rare mayfly species” Behningia baei, the study said. Photos show these brown insects, which blend in with the surrounding sand.