Screw worm flies are about twice the size of a common housefly. They are identified by an iridescent greenish blue body and orange eyes. Screw worm flies are categorized as either Old World (Chrysomia bezziana) or New World (Cochliomyia hominivorax). The word “hominivorax” means “man-eater,” which is quite literally true. Old World screw worm flies inhabit Africa, parts of the Middle East, New Guinea, and Southeast Asia. The latter are a scourge in Central and South America.


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