An adult Brood X periodical cicada sheds its exoskeleton after spending 17 years underground in Washington, DC, USA, 14 May 2021 (issued 15 May 2021). After molting, the cicada's body dries and hardens, then the 17-year-old bug looks for a mate. Trillions of Brood X cicadas are emerging in the Mid-Atlantic region of the US this year. EPA-EFE/JIM LO SCALZO
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