A new study of two significant pest fruit fly species finds that the size of males influences female mating choice in one of the species, but not in the other—important knowledge for fine-tuning management efforts for both species via the sterile insect technique. Here, female Mexican fruit flies (Anastrepha ludens), one of the species in the study, are shown. (Photo by Jack Dykinga, USDA Agricultural Research Service, Bugwood.org)