(Pierre, SD) — Move aside mosquitoes, mayflies are now taking over South Dakota. These bugs emerge as adults around this time of year in July and August. They swarm in big clouds together and it almost looks like a blizzard. Mayflies have a very short lifespan, only living up to 48 hours. But thankfully, they won’t bite you unlike mosquitoes. Mayflies are attracted to light, so outdoor lighting has to be turned off if you don’t want them around your house.