Two long term broods are due to hatch in the same season, Brood XIII (every 17 years) and Brood XIX (every 13 years). The last time this happened was in 1803. Perhaps this a portent of the end of days?
US to be inundated by swarm of cicadas for first time in over 200 years
US to be inundated by swarm of cicadas for first time in over 200 years