House fly
yellow to red, to brown, to black as the pupa ages. New adult flies will emerge as early as two days after pupation (at temperatures above 30°C) or over three [...] Believed to have originated in central Asia, the insect expanded its range worldwide long ago as a commensal organism to human populations; the housefly [...] viruses (such as the Newcastle Disease virus), bacteria (such as Salmonella and E. coli ), protozoan parasites (such as Giardia ), and the eggs of many