A cicada emergence hole is identified and marked by researchers and students from the University of Indiana being part of a study investigating the effects of cicada emergence on the release of greenhouse gasses as Brood X or Brood 10 cicadas have begun emerging from the earth after 17 years, in Bloomington, Indiana, U.S., May 21, 2021. Picture taken May 21, 2021. REUTERS/Cheney Orr