In the nests of Bombi are found various beetle larvae that live as inquilines or parasites, and also maggots of drone-flies (V olucella), which act as scavengers; the Volucella-fly is usually a" mimic ' vades.
Phagocytes act as scavengers in ridding the body of noxious particles, and more especially of harmful bacteria.
There is, of course, no sewerage system, the surfaces of the streets serving that purpose, and what garbage and refuse is not consumed by the dog scavengers washes down into the Tigris at the same place from which the water for drinking is drawn.
Others are scavengers feeding on decaying organic matter; the pond skaters, for example, live mostly on the juices of dead floating insects.
Among birds of prey, four vultures are found, including the common scavengers (Gyps indicus and G.