In literature, the sudden rise of rats from hidden burrows into daylight has often symbolised something far more profound than mere infestation. In Albert Camus’ The Plague, the first sign of catastrophe in the city of Oran is the inexplicable behaviour of rats emerging from sewers and collapsing in the streets. George Orwell, too, used the rat as a deep psychological metaphor for fear and coercion in 1984, most famously in the torture imagery of Room 101.
From folklore such as the Pied Piper of Hamelin to modern cinema like Ratatouille and Flushed Away, rats have oscillated between symbols of terror, survival, and even unexpected ingenuity. Yet, in today’s Dhaka, this symbolism is no longer confined to fiction. It is increasingly becoming a lived urban reality—one that is reshaping the identity of the megacity itself.
Dhaka, a rapidly expanding South Asian metropolis, is undergoing an infrastructural transformation marked by flyovers, metro rail systems, expressways, and high-rise developments. However, beneath this surface of modernisation lies an expanding subterranean ecosystem of sewers, drains, and utility tunnels that has become an ideal habitat for rodents. The city is, in effect, evolving into what might be described as a “Ratropolis”—a parallel urban system thriving beneath and within the human city.
A recent local report highlighted a sharp rise in rodent activity across residential neighbourhoods, markets, restaurants, drainage networks, and even modern commercial buildings. Beyond being a nuisance, this trend raises serious public health concerns, as rats are known carriers of more than sixty zoonotic diseases, including leptospirosis, salmonellosis, and scrub typhus.
Table of Contents
The Hidden Ecology of a Megacity
Urban ecosystems depend on balance. In earlier decades, Dhaka’s environment maintained a natural form of biological regulation. Crows, kites, owls, and other predators played a critical role in controlling rodent populations. However, rapid urbanisation, loss of green cover, pollution, and toxic waste have significantly disrupted this equilibrium.
The disappearance of scavenging birds such as crows has removed a crucial layer of natural waste management. Similarly, the decline of predators like owls and small carnivores has allowed rodent populations to expand with minimal resistance. As a result, uncollected waste, open dumping, and poorly managed drainage systems now serve as continuous food sources for rats.
In ecological terms, the city has inadvertently created a self-sustaining feeding network for rodents—one that functions independently of human control.
Comparative Urban Responses
Different global cities have adopted varied strategies to manage rodent populations:
| City | Primary Strategy | Key Feature | Outcome |
|---|---|---|---|
| New York | Fertility control + smart bins | Rodent birth control programmes and sealed waste systems | Gradual population reduction |
| Paris | Coexistence model | Monitoring, traps, and sanitation upgrades | Stabilised population |
| London | Sensor-based tracking | AI thermal mapping and IoT traps | High precision control |
| Istanbul | Predator balance | Large urban cat population and strong sanitation culture | Naturally low visibility of rats |
| Dhaka | Fragmented approach | Open waste systems and limited ecological planning | Rapid population growth |
This comparison highlights a critical distinction: successful cities treat rodent control as an integrated ecological and infrastructural challenge, not merely a sanitation issue.
Underground Cities and Surface Risks
Dhaka’s sewer systems and drainage corridors form a vast interconnected network beneath the surface. Within this hidden infrastructure, rodents have established what is effectively a parallel city. Unlike fictional depictions, however, this “sub-city” directly interacts with the surface environment—entering kitchens, commercial spaces, basements, and even modern air-conditioned buildings.
The risk is not merely structural but epidemiological. Flooded streets during monsoon seasons create pathways for contamination, allowing pathogens carried by rodents to enter human systems indirectly through water exposure.
Ecological Imbalance and Its Drivers
Several interconnected factors have accelerated this situation:
- Open waste disposal systems functioning as continuous food sources
- Reduction in natural predators due to habitat loss
- Increased concrete surfaces replacing green ecological buffers
- Chemical-laden waste affecting bird and predator populations
- Inadequate segregation of organic and toxic waste
Together, these factors have weakened natural regulatory mechanisms that once kept rodent populations in check.
Towards Integrated Urban Pest Management
Experts broadly advocate for Integrated Pest Management (IPM), a multi-layered strategy combining infrastructure reform, ecological restoration, and behavioural change. Key interventions include sealed waste containers, improved drainage design, and structural sealing of basements and pipelines.
Equally important is ecological restoration. Reintroducing predator species—particularly owls, small carnivores, and scavenger birds—can help re-establish natural population control mechanisms. Urban green corridors and pocket forests can provide nesting habitats for these species.
Mint cultivation and natural deterrent landscaping may offer limited supplementary effects, but structural waste reform remains the most decisive factor.
Lessons from Nature and Literature
In The Plague, rats symbolise an approaching catastrophe that humans initially ignore. Similarly, in Dhaka, rodents are not merely pests but indicators of systemic imbalance. Like the Trojan Horse of Greek mythology, they represent a hidden threat emerging from within the city’s own infrastructure.
Yet, unlike fictional inevitability, this situation remains reversible. Cities such as Singapore, Tokyo, and parts of Europe demonstrate that disciplined waste management and ecological planning can dramatically reduce rodent prevalence without resorting to excessive chemical intervention.
Conclusion
Dhaka’s transformation into a “Ratropolis” is not a natural inevitability but a consequence of urban design, waste mismanagement, and ecological neglect. The solution lies not in eradication alone, but in restoring balance—between infrastructure and nature, between human activity and ecological limits.
A city cannot be defined solely by its roads, rail systems, or skyscrapers. It is defined by the invisible systems that sustain or destabilise it. If Dhaka is to remain a true metropolis rather than a Ratropolis, it must urgently reimagine its relationship with waste, wildlife, and the fragile ecosystems that quietly govern urban life beneath its streets.