By releasing sterile male screwworm flies, scientists were able to eradicate the devastating pest after World War II—and they’ve been able to control the fly once again after it re-emerged in 2016. The sterile male screwworm fly (Cochliomyia hominivorax) pictured above is marked with a numbered tag to study dispersal, behavior, and longevity. (Photo credit: Peggy Greb, USDA Agricultural Research Service, Bugwood.org)