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The Night-shift Predator Reshaping How We See Colombo's Wetlands
Updated: Sep 18
At night, Colombo rearranges itself.
The traffic thins. Shop shutters come down. Drain water whispers past concrete. Dogs take over certain corners with the confidence of regular patrons who have claimed the best table for years. And somewhere along a canal edge, between reeds, road glare and back walls, a fishing cat steps into the shift.
Not a house cat. Not a rumour with whiskers. A wild wetland hunter with partially webbed feet and the calm, workmanlike focus of an animal that knows exactly where the fish, shadows and exits are.
This is one of the quietest marvels in Sri Lanka: a Vulnerable wild cat moving through the city by reading a map most people never see.
We tend to notice the official city, including the roads, towers, lanes, plots, developments, the places someone has named and priced. The fishing cat uses another one. Its map is drawn in marsh edges, culverts, mangroves, canal margins, fish ponds, reedbeds and those damp scraps of ground humans often describe as if they were failing to become something else.
The fishing cat, Prionailurus viverrinus, is one of Sri Lanka’s most distinctive wild felines: powerfully built, elusive and unusually adapted to wet places. It swims. It hunts fish. It moves through marsh and mud with the sort of practical competence that makes human beings, with all our committees and drainage plans, look slightly overcomplicated. Despite its name, it does not live on fish alone, and research in Sri Lanka has shown a broader diet that includes birds and mammals too. For an animal given such a literal name, it has turned out to possess a refreshingly non-literal life.
It has also turned up in places many people would not expect. In Sri Lanka, fishing cats have been recorded not only in wetlands that look reassuringly “wild”, but even in highland landscapes and urban landscapes, including Colombo’s wetland mosaic, where water, settlement, traffic and remnant habitat overlap in uneasy but very real coexistence.
That matters because it gently corrects a common simplification, and does so with some style. The fishing cat is not just a novelty defined by fish. It is a wetland specialist with a broader ecological life than its name suggests.
Why This Matters
The fishing cat is currently listed internationally as Vulnerable, and the broad concern is not mysterious. Across its range, wetland loss, degradation and direct killing by people remain central pressures. In Sri Lanka, it is listed as Endangered and that global picture becomes locally meaningful because the species is native to the island and depends on habitats that are both ecologically productive and frequently treated as expendable.
One useful place to start is with what the cat is doing simply by being there. Fishing cats are predators within wetland food webs. That does not mean an entire ecosystem hangs on one species. It does suggest that when a wetland predator is still using a landscape, some wetland functions and prey resources remain.
At the same time, there are limits to what the current evidence can tell us. The species is documented in a number of Sri Lankan settings, including urban landscapes, but national-scale distribution remains unevenly understood. Some threats are well evidenced. Others, especially long-term biological effects from pollution exposure, are visible as warning signals but not yet fully quantified.
The Challenge
The challenge is best understood as a systems problem, not a morality play, which is less dramatic but much closer to the truth.
A wetland is rarely under pressure from one dramatic event alone. More often, it is altered by a chain of ordinary decisions: what gets filled, what gets drained, what gets connected, what gets separated, what is monitored and what is dismissed as unused land. For a species like the fishing cat, those decisions shape whether movement remains possible across a landscape or becomes a series of increasingly narrow interruptions.
In Colombo, that overlap is especially clear. Research has shown fishing cats using home ranges that include a substantial proportion of human-dominated areas. That does not mean the city is easy for them. It means they are navigating a shared workspace built for other priorities. Fishing cats in Colombo should not be treated only as symbols of urban wildlife resilience; they also show how much the city still depends on functioning wetlands, connected waterways and careful land-use decisions.
Once that overlap exists, the risks multiply. Fishing cats moving through urban or peri-urban areas may face roadkill, persecution and dog attacks. Pollution adds another layer. A 2023 scat study found macroplastics, mesoplastics and microplastics, which suggests that urban wetland food webs are carrying contamination into the species’s environment. That is reason for concern, but not a reason to overstate what is known. Exposure is documented. Population-level health effects in Sri Lanka still need clearer study.
So the conflict is not between people on one side and wildlife on the other. It is closer to faulty wiring in a shared building. Wetlands, roads, settlements, legal protections, reporting systems, drainage decisions and habitat fragments are all connected. When one part is neglected, pressure travels through the rest.
Who’s Doing Something About It
The visible work around fishing-cat conservation in Sri Lanka is not built around spectacle. It is built around people steadily paying attention to a cat that rarely makes things easy for them.
Research projects, reporting systems, wetland governance processes and conservation organisations all help with the same basic task: making sure this cat does not vanish twice, first from the marsh, and then from attention. The Urban Fishing Cat Conservation Project has created a public-facing channel (https://fishingcats.lk/) for sightings, roadkill reporting, camera-trap work, GPS tracking and research communication. That kind of platform matters because a species that can slip past most people unnoticed can also slip past planning, budgets and everyday concern.
Small Cat Advocacy and Research (SCAR) has supported this broader fishing-cat conservation space, helping create continuity around species-focused work. University-linked research has also been important in building the evidence base, especially in Colombo and Kirala Kele. Together, these efforts do something simple but essential: they turn scattered encounters into knowledge that can travel into conservation and planning decisions.
That may sound administrative until you remember the raw material is a cat moving through canal edges and marsh shadows while most of the city is asleep.
There is also a wider governance layer. Colombo’s wetland landscape is shaped by planning and management systems that were not designed around one damp-footed night worker, which is exactly why they matter. The fishing cat depends in part on whether wetlands remain legible within urban decision-making as functioning infrastructure rather than leftover land.
The People Already Helping
Several contributors stand out in the published records because they help turn scattered signs of the species into something people can actually work with.
Anya Ratnayaka is closely associated with research on fishing cats in Colombo, following how a wetland predator continues to move through a city of walls, water edges and interruptions. Her work helps connect species records to larger questions about how wetlands function within cities.
Ashan Thudugala is publicly linked to fishing-cat conservation practice through SCAR and species-focused project work, helping keep response and coordination alive after the rare moment when the animal briefly becomes visible to people. That contribution matters because field conservation depends not just on study, but also on ongoing implementation, coordination and response.
Therangika Ashani Hangawatte is linked to research connected to plastic ingestion and species evidence in Colombo, tracing what the city leaves behind and how that residue travels back into wetland life. Work of this kind helps move the conversation beyond presence alone and towards the quality of the environments the species is using.
The Kirala Kele research team adds another layer of evidence outside the Colombo context. Their work on presence, threats and diet helps prevent one urban landscape from becoming the entire story of the species in Sri Lanka.
And beneath the names that travel publicly, there are usually many others holding the work together: field assistants, students, sanctuary staff, local observers, planners and community participants. Conservation often depends on people whose contribution is infrastructural rather than visible.
The Systems This Work Runs Through
The first system is the reporting and research network built around species documentation. When sightings, roadkill records, camera-trap data, GPS tracking and scat analysis are connected, the fishing cat becomes less dependent on anecdote. Without that system, the species remains easier to misread, either as absent where it persists or secure where it is under pressure.
The second is the organisational platform that stops fishing-cat work from beginning again each time the animal briefly appears and then melts back into the reeds. Institutional continuity matters because conservation can lose ground simply when the thread is dropped. Without organisational support, useful efforts can collapse into isolated records and unfinished momentum.
The third is the wetland planning and governance system, especially in landscapes such as Colombo. This system determines whether wetlands are retained, restored, connected or reduced to fragments. Without it, habitat decisions are made in narrower ways that can miss how species actually move through cities.
The fourth is the legal protection framework. Law is not a glamorous habitat, but it can still decide whether harm is treated as unfortunate, routine or unacceptable. Sri Lanka’s wildlife protection architecture provides a formal basis for protection, including for the fishing cat. Without legal recognition, response mechanisms become weaker, and harm is more easily normalised.
The fifth is the university and research pipeline. Site-level studies create the evidence needed for better public understanding and better policy. Without that pipeline, uncertainty is filled by guesswork, and guesswork is rarely kind to species that already live at the edge of notice.
For an animal that is so often reduced to a rumour, that accumulation of patient evidence is its own kind of rescue.
What You Can Do
Easy
You could reduce the chance of litter reaching canals, marshes, drains and wetland edges. That is a modest action, but in Colombo there is already evidence that fishing cats are being exposed to plastic through the food web.
Small choices add up: dropping off old electronics through Dialog’s e-waste initiative, for instance, prevents heavy metals and toxic waste from leaching into urban waterways. If you know of other local waste management or drop-off initiatives doing similar work, please reach out to us at orgs.srilanka@theplayn.com, as we would love to feature them.
Practical
How you can help depends mostly on how close you live to these habitats.
If you live near canals, marshes, ponds or wetland edges: The choices you make right at home directly shape the habitat. You can keep drains and wetland edges free of plastic and discarded fishing line, avoid clearing reedbeds or bank vegetation unnecessarily and ensure poultry or fish ponds are secured with wildlife-safe barriers rather than harmful traps.
Because domestic health connects to wildlife health, keeping your cats and dogs vaccinated, and spaying or neutering free-roaming pets, reduces the risk of disease transmission and roaming conflicts.
When driving near wetland roads at night, a little extra caution goes a long way.
Most importantly, never trap, chase, feed or handle a fishing cat. Also, avoid sharing precise locations publicly; well-intentioned attention can cause unnecessary disturbance, increase risks to the animals or draw crowds into sensitive wetland habitats.
If you live farther away from wetland systems: Your role shifts towards advocacy and awareness. You can support local wetland protection efforts, voice questions about developments that involve filling in wetlands or altering canals, and help schools or community groups understand that urban wetlands are functioning ecosystems rather than vacant land.
Sharing accurate information about the species without sensationalising it helps build a realistic, protective community mindset.
Deep
You could support wetland retention, restoration and connectivity-sensitive planning in your community or professional space. This is slower work and often less visible, but it shapes whether wetland species can persist in lived landscapes. If that role fits your life, it matters. If not, that is okay too.
Your One Move
If you ever see what may be a fishing cat, remember four words:
See. Record. Report. Retreat.
See it calmly.
Record the time, place and direction from a safe distance.
Report it to a recognised channel such as save.cat or the Department of Wildlife Conservation.
Retreat without approaching it, feeding it, chasing it or posting its exact location publicly.
It is not glamorous, but it is genuinely useful.
Why This Matters and When You Might Use This
That single act can matter more than most people realise. One careful sighting can add to records of occurrence and movement. One roadkill report can identify a danger zone. One documented record can strengthen the case that a wetland still functions as habitat. Small acts are not trivial when a species lives at the edge of notice.
You may not always spot a fishing cat yourself, but that does not mean you cannot make a real difference. When you pass this story along to a friend who shares your curiosity, you can set off a wonderful chain reaction across networks you might never even see. Imagine a field researcher discovering a crucial new pocket of habitat, a generous supporter unlocking much-needed funding or a passionate volunteer finding their true calling, all because you took a second to spark that connection. Every time this message ripples outwards to new eyes, a whole community of defenders is alerted to rally around these secretive wetland hunters, and you hold the key to starting that incredible movement today.
And there is a deeper invitation here too.
You do not need to become a biologist to help a fishing cat. You may simply begin to see wetlands differently: not as empty ground, but as living systems. The sort of neighbour who sees reedbeds as shelter, canals as corridors, marshes as alive with consequences. The sort of citizen who understands that a city’s intelligence is measured not only by what it builds, but also by what it has the wisdom to leave functioning.
That shift in attention sounds modest. It is not. Public imagination is part of habitat. Places survive longer when people can describe why they matter.
Final Thought
A fishing cat asks for a particular kind of attention.
Not the loud kind that arrives only when a place becomes famous, or damaged beyond denial. The quieter kind. The kind that notices a marsh before it is rewritten as spare land, and understands that a living system can depend on what looks, at first glance, like the edge of the map.
In that sense, the fishing cat is not only surviving in wetlands. It is also still working the night shift along narrow, watery routes through human decisions, and its presence is one of the clearest signs that the map is not empty yet.
For Advocates:
If this helped you put the species into words, you could share it with someone who thinks of wetlands as empty ground.
For New Readers:
If this is your first time meeting the fishing cat, welcome. You can join the Playn as someone learning to notice the living systems that sit just outside the obvious frame.
What We Still Need To Know
Nature and Science
- How do fishing cats use different wetland types across Sri Lanka beyond the sites already studied?
- How does diet shift between protected wetlands and urban wetland mosaics?
- What are the long-term biological effects of plastic exposure beyond the fact of documented ingestion?
People and Culture
- Where do the main points of friction emerge between fishing cats and people in human-dominated landscapes?
- Which communities already hold practical coexistence knowledge that conservation systems can learn from?
- What forms of support make coexistence feel workable in daily life?
Systems and Policy
- How does legal protection translate into actual response when a fishing cat is injured, killed or reported?
- How is wetland connectivity handled in planning decisions across Colombo and other parts of Sri Lanka?
- What happens to public sightings and roadkill reports after submission?
Innovation and Technology
- Where could low-disturbance tools such as camera traps and GPS tracking close the most important knowledge gaps?
- How can reporting systems become easier to use while still screening out mistakes?
- Which tools are most useful for tracking wetland change in ways that support real conservation decisions?
Ethics and Public Imagination
- Why are wetlands so often treated as spare land until a visibly charismatic species appears in them?
- What changes when people begin to see a marsh as inhabited rather than empty?
- Can public culture learn to value quiet ecological infrastructure before it becomes an emergency story?
Know an expert we should be speaking to? Invite them — click here.
If you’re that expert, click here or reach out to experts.srilanka@theplayn.com.
We’re building an open database of conservation experts and organisations — your insight can directly shape Version 2, which will carry expert opinions.
And if you’re a photographer (or know one) with Fishing Cat photos you’re willing to share for public education, click here — or pass this message on. Your images will help thousands learn.
Editorial note
A version of this article was published as a public-interest feature in the Daily Mirror (click here)
The aim of the feature was not to promote a single solution but to bring the story of the fishing cat and Sri Lanka’s wetland conservation into everyday understanding. It shifts the conversation from abstract ideas toward the real places, people, and nature that shape how fishing cats and people share space.
This article is treated as an open public-interest record.
Researchers, practitioners, policymakers, community members, and others with direct knowledge of fishing cats and wetland conservation are invited to share corrections, context, or perspectives that could strengthen future versions of this work: www.srilankasendangered.com/respond
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