The buzzing sound is appearing across the area. Cicadas are being heard by Marylanders.
They generally appear every 13 or 17 years, but they're popping up now. The cicadas weren't supposed to come out from underground until 2021.
Experts don't have an exact reason as to why they've appeared, but say global warming, natural competition and avoiding predators are possibilities.
The cicadas that have emerged will start to die out in July, but when they come in 2021, experts say we could be dealing with trillions of cicadas.