http://www.newsweek.com/incredible-cicada-video-brood-x-bug-emerging-exoskeleton-1596911 > A park ranger has captured incredible time-lapse footage of a periodical cicada emerging from its exoskeleton in Maryland's Catoctin Mountain Park. > Periodical cicadas are seven species from the genus Magicicada, which emerge every 13 or 17 years in North America.