	Blow flies typically are the first to arrive when blood or body fluid is present. Hence, blow flies are the primary means of estimating a time of death in case work. The life cycle from egg to maggot to adult has been researched thoroughly; therefore, the estimation from egg to adult is accurate within simply a few hours based upon temperature and climate during previous days. This estimation is crucial when determining a time of death to further an investigation. Specifically, "Lucilia illustris" is found on carrion located in sunlight or otherwise bright areas.