Considering the size of Neill Blomkamp’s filming area for the (excellent) film District 9 (36 acres), and the stated alien population (1,800,000), the population density of District 9 would have to be an amazing 50,000 aliens per acre. Perhaps, most of the aliens were eggs? For comparison, the typical population density of ancient cities was 100 persons per acre. The filming area is now uninhabited empty land in eastern Chiawelo.